Crowbar Tower: Does 1 Damage per Hit. Upgrade 1: Attack Cooldown Slightly Decreased. Upgrade 2: Now Pops 2 Layers of Balloons per hit. Upgrade 3: Attack Cooldown Slightly Decreased.

RPG Tower: A belt-fed RPG on a tripod. Deals explosive damage.
Path 1:
Upgrade 1 - Bigger blast radius.
Upgrade 2 - RPGs now blast out fragments which pop gballoons. (Means error gballoons can be popped by them.)
Upgrade 3 - Armour piercing rockets now deal more damage to strengthened gballoons and gblimps as well as pop black gballoons. (Marble, ceramic, all that)
Upgrade 4 - Instead of fragments, RPGs blast out mini bombs, dealing more damage.
Upgrade 5 - RPGs now stun gballoons (Immobilize, dunno if you can do that)

Path 2:
Upgrade 1 - Increased fire rate.
Upgrade 2 - Increased range.
Upgrade 3 - RPGs now have better engines, meaning faster speed.
Upgrade 4 - Rockets now become incendiary, dealing huge damage to gblimps and setting gballoons on fire.
Upgrade 5 - Flames become more volatile, dealing more damage and burning through many layers per second.

Ice Tower: An ice orb on a pedestal. Freezes (Immobilizes) bloons in it's range. Doesn't deal damage at 0-0 upgrade.
Path 1:
Upgrade 1 - Increased range.
Upgrade 2 - Freezing now pops a layer.
Upgrade 3 - Colder freezing causes gballoons to be slowed for a short time after being frozen.
Upgrade 4 - Freezing now pops three layers.
Upgrade 5 - Freezing now pops five layers, and causes other gballoons which come in contact with frozen gballoons to be frozen too.

Path 2:
Upgrade 1 - Causes gballoons to be frozen for longer.
Upgrade 2 - Deep freezing causes two layers to be frozen.
Upgrade 3 - Freezing occasionally causes the ice orb to release ice shards which deal extra damage.
Upgrade 4 - The ice orb's range greatly increases and it can now shoot out ice shards as well as freeze nearby gballoons.
Upgrade 5 - Ice shards now release fragments which pop more gballoons.

Those are some good ideas! I'll see if GMod has enough stock assets to make those towers.
In the meantime, due to the way I have coded the system, up to 8 upgrade paths can be added, 15 upgrades each. Go crazy!

I like to keep myself limited, but you can branch off of these ideas if you want man. Thanks anyways! I'll keep on it.

Hmm, an interesting idea this one.

Chaingun Tower: A stationary, player-controlled chaingun attached to a heavy stand. (If you need a picture I can send you one wherever.) It's controlled by a device the player uses. Has a camera if placed far away so the player can use the chaingun from it's PoV. (Point of View)

Path 1:
Upgrade 1 - Faster fire rate.
Upgrade 2 - Bullet spread decreased greatly.
Upgrade 3 - Red hot bullets increase damage and allow it to pop gray gballoons.
Upgrade 4 - Chaingun tower now fires lasers instead of bullets.
Upgrade 5 - Chaingun tower turns into a huge laser.
Upgrade 6 - Laser becomes a plasma laser, increasing damage by a huge level.

Path 2:
Upgrade 1 - Can pierce up to 6 gballoons. (Bullet pops gballoon, and passes through to pop the next, up to the 6th.)
Upgrade 2 - Special gballoon acid allows the turret to pop any gballoon.
Upgrade 3 - Upgrades to the camera allow it to register hidden gballoons from any distance.
Upgrade 4 - Bullets turn to mini explosive rockets that deal extra damage to ceramic, brick, marble and gblimps.
Upgrade 5 - Armour-piercing rockets can now pop black gballoons and deal extra damage to strengthened gballoons.
(Optional) (Ability) Upgrade 6 - Upon activation, a player can choose a location for at least 25-50 rockets to bombard. (If possible to be done by the tower pointing up and launching the rockets in an animation, that's be awesome.)

Tank Tower: A stationary tank.

Path 1:
Upgrade 1 - Gains a machine gun.
Upgrade 2 - Armour piercing bullets and shells can pop gray gballoons.
Upgrade 3 - Fire rate of the main gun and machine gun increased.
Upgrade 4 - Incendiary shells cause gballoons to be set alight when hit.
Upgrade 5 - Fire becomes more volatile and increased armour piercing deals huge damage to gblimps.

Path 2:
Upgrade 1 - Range increased.
Upgrade 2 - Shell blast radius increased.
Upgrade 3 - Tank becomes a Self-Propelled Gun (Artillery on a tank body) and has infinite range. Works similar to a mortar.
Upgrade 4 - Shell blast radius and damage greatly increased.
Upgrade 5 - Shell now blows up into 8 mini bombs.

Oh my. I didn't think any of my towers would be able to be added to the game. Thank you.

New Suggestion bois

Microwave Tower: A tower that is similar in style to a tesla coil but fires heat rays to pop gballoons. Expensive, but can pop gray, black and monochrome gballoons. Microwaves pop 1 layer on base level and can pierce up to 3 gballoons.

Path 1:
Upgrade 1 - Microwaves reach longer ranges.
Upgrade 2 - Hotter microwaves now pop 3 layers.
Upgrade 3 - Thermal detection allows the tower to detect hidden gballoons and monochrome gblimps.
Upgrade 4 - Microwaves now pop 5 layers and the tower fires multiple microwaves at multiple gballoons. Range increases.
Upgrade 5 - Microwaves have a chance to bounce off the layers of a gballoon, allowing huge damage to be inflicted upon them.

Path 2:
Upgrade 1 - Microwave fire rate increased.
Upgrade 2 - Microwave length increases, meaning they can now pierce 6 gballoons.
Upgrade 3 - Microwaves can scatter when hitting a gballoon, meaning they can ricochet onto other gballoons.
Upgrade 4 - Microwaves now have a chance to set gballoons alight, which pop 2 layers per second.
Upgrade 5 - Microwaves now set gballoons alight, which pops 5 layers per second, and the tower now gains an ability where it can spawn a circle of fire around itself.

That is actually implementable. However, I'm actually adding a tower which is a combination of a Farm and Village right now.

...Darn you, hidden gBs.

Rainbow Portal: A tower that as it's name suggests, is a rainbow portal, that, with a charging period of 7 seconds, fires a rainbow laser for 2 seconds obliterating any gBalloons that come into contact with it. Probably an end-game tower.


Path 1:
Enhanced Prisms-The Rainbow Portal uses enhanced prisms to capture the light better and is now able to pop a blimp.(Only the first level of blimp).
Second Spectrum-Our scientists have discovered a second set of spectrum which allows the Rainbow Portal to fire more concentrated beams of light, increasing the duration of the firing period to 5 seconds, but increases the charging period to 10 seconds.
White light-The Rainbow Portal is now able to access white light, gaining an ability that, when used, fires a beam at any target, obliterating it, whether it be blimp or gBalloon.



Path 2:
Magic Based Beams-The Rainbow Portal now uses magic light to attack even gBalloons with energy-resistant properties.
Burning Light-The Rainbow Portal concentrates beams of light hot enough to melt through metal and other heat-resistant gBalloons.
Rainbow Overlord-If this is purchased when other Rainbow Portals are nearby, it gains an additional -0.5 charging time for each Rainbow Portal nearby.

That is an interesting idea! I'll keep it in mind.

@Piengineer
This new tower is very interesting, I like it!

Hmm, I think this could be possible, but I'm not entirely sure. Expensive and shells originally pop 3 gballoons.

Battleship: A warship which can only be placed in water.

Path 1:
Upgrade 1 - Fragmenting shells pop 5 layers of gballoons.
Upgrade 2 - Red hot shells can pop gray gballoons.
Upgrade 3 - Battleship gains a hatch which can occasionally fire a missile anywhere on the map. Deals increased damage to strengthened and ceramic gballoons.
Upgrade 4 - Battleship now gains a secondary hatch, which when shot at, fires an ICBM missile that destroys any gballoon up to a green gblimp in a small blast radius.
Upgrade 5 - ICBM becomes radioactive and incendiary, allowing it to somehow bypass and 1-shot any gballoon below a rainbow gblimp and deals fire damage in a huge radius.

Path 2:
Upgrade 1 - New firing mechanism increases the battleship's range.
Upgrade 2 - Advanced microchips are now put into use in towers, allowing the battleship to target gballoons in other tower's ranges.
Upgrade 3 - Battleship reforms into an aircraft carrier, which sends out up to 4 little fast firing aircraft to pop gballoons effectively.
Upgrade 4 - Aircraft carrier now increases in size, meaning it can now send up to 6 aircraft, and can now place towers upon it's upper deck.
Upgrade 5 - Aircraft now fire missiles which deal extra damage to strengthened, marble, brick and ceramic gballoons and gblimps. Carrier now becomes much bigger in size, becoming a supercarrier which can station a lot of towers on the upper deck and can send out 12 aircraft!

And then I'll just do a spinoff of the super monkey.

The Manifestation: A white ghostly figure (Probably a GMan) which throws bullets that can pop 1 layer of gballoon at an extremely fast rate. Extremely expensive, as are the upgrades.

Path 1:
Upgrade 1: The Manifestation now fires lasers from it's eyes instead of bullets, dealing more damage.
Upgrade 2: The Manifestation now fires plasma beams from it's eyes, popping gray gballoons.
Upgrade 3: The Manifestation now becomes a powerful godlike avatar, firing beams which deals huge damage to gballoons. Gains an aura and becomes slightly bigger in size.
Upgrade 4 : The Manifestation can now become a huge temple (Temple of Destiny) which fires immense beams, obliterating gballoons.
(Optional) towers near The Manifestation will fuse with the Manifestation, which gives it abilities:
Orb of Cold: Temple of Destiny now fires orbs at absolute zero temperature, which freeze gballoons in a big range.
Gatling Gun Knight and/or Sniper Queen: Temple of Destiny occasionally shoots out bullets in a ring.
Electrostatic Barrel: Temple of Destiny shoots down large lightning bolts which shock a huge amount of gballoons.
Proximity Mine: Temple of Destiny occasionally fires a huge missile which deals massive damage to strengthened, marble, brick, ceramic gballoons and all gblimps.
Upgrade 5: Harnessed energy from the void allows the Temple of Destiny to become the Temple of Doom. Bypasses damage limit of purple (or magenta) and rainbow gblimps.

Path 2:
Upgrade 1: The Manifestation's vision becomes better, allowing a larger range.
Upgrade 2: The Manifestation gains ultravision, allowing it to see hidden gballoons and increasing range.
Upgrade 3: The Manifestation becomes a cyborg, gaining two guns which fire bullets, lasers or plasma beams, depending on which upgrade you have.
Upgrade 4: The Manifestation gains an ability which, when shot, destroys all gballoons in a small radius near it, along with blue and red gblimps.
Upgrade 5: The Manifestation's bullets become radioactive beams which deal massive damage to gballoons. It's ability also allows it to obliterate green gblimps too.