Made several balance changes:

Electrostatic Barrel:
+ X-2 and X-3 upgrade paths have been swapped.
+ X-2 (used to be X-3) upgrade cost decreased from 1500 to 750.
- Base range reduced by 1%.
- X-3 (used to be X-2) upgrade cost increased from 600 to 1000.

Proximity Mine:
- X-2-X and X-3-X upgrade paths have been swapped.
+ X-2-X (used to be X-3-X) upgrade cost decreased from 4000 to 1000.
- X-3-X (used to be X-2-X) upgrade cost increased from 2000 to 3000.

Sniper Queen:
+ 2-X upgrade cost decreased from 750 to 500.
+ 3-X upgrade cost decreased from 3000 to 2500.

Ally Pawn:
+ Base fire rate increased by 100%.

Rainbow Beamer:
+ 4th upgrade now reduces charging delay by 1 second.
- 4th upgrade now reduces beaming time by 1 second.
+ 6th upgrade now affects surrounding gBalloons.

Added and changed several things:

Electrostatic Barrel:
+ Base range increased by 1%.
- Base cost increased from 350 to 400.
- 1-X upgrade cost increased from 250 to 350.
- 2-X upgrade cost increased from 500 to 700.
- 3-X upgrade cost increased from 1500 to 3000.
- 4-X upgrade cost increased from 10000 to 20000.
- X-1 upgrade cost increased from 250 to 400.
- X-2 and X-3 upgrade paths have been switched.
- X-3 (formerly X-2) upgrade cost increased from 500 to 1500.

Proximity Mine:
+ X-X-5 upgrade damage increased from 205 layers to 3277 layers.
- Base cost increased from 500 to 650.
- 1-X-X upgrade cost increased from 450 to 500.
- 2-X-X upgrade cost increased from 900 to 1000.
- 3-X-X upgrade cost increased from 1500 to 2000.
- 4-X-X upgrade cost increased from 2000 to 5000.
- 5-X-X upgrade cost increased from 5000 to 15000.
- X-1-X upgrade cost increased from 500 to 750.
- X-2-X upgrade cost increased from 1500 to 2000.
- X-3-X upgrade cost increased from 3500 to 4000.
- X-4-X upgrade cost increased from 5000 to 10000.
- X-5-X upgrade cost increased from 50000 to 75000.
- X-X-1 upgrade cost increased from 550 to 650.
- X-X-2 upgrade damage multiplier reduced from x5 to x3.
- X-X-2 upgrade cost increased from 750 to 1500.
- X-X-3 upgrade cost increased from 1000 to 2000.
- X-X-4 upgrade cost increased from 2000 to 10000.
- X-X-5 upgrade cost increased from 10000 to 50000.

Sniper Queen:
- Base cost increased from 200 to 250.
- 1-X upgrade cost increased from 250 to 350.
- 2-X upgrade cost increased from 400 to 750.
- X-1 upgrade cost increased from 250 to 350.
- X-2 upgrade cost increased from 500 to 2000.
- X-3 upgrade cost increased from 1000 to 4000.
- X-4 upgrade cost increased from 30000 to 100000.

Gatling Gun Knight:
- Base cost increased from 400 to 550.
- 1-X upgrade accuracy decreased from +100% to +33%.
- 1-X upgrade cost increased from 200 to 350.
- 2-X upgrade cost increased from 600 to 850.
- 3-X upgrade cost increased from 1000 to 4000.
- 4-X upgrade cost increased from 2500 to 15000.
- 5-X upgrade cost increased from 10000 to 50000.
- 6-X upgrade damage multiplier reduced from x3.2 to x3.
- 6-X upgrade cost increased from 100000 to 250000.
- X-1 upgrade cost increased from 175 to 250.
- X-2 upgrade cost increased from 400 to 2000.
- X-3 upgrade cost increased from 2000 to 7500.
- X-4 upgrade cost increased from 3500 to 15000.
- X-5 upgrade cost increased from 5000 to 30000.
- X-6 upgrade cost increased from 10000 to 75000.

Orb of Cold:
+ X-5-X upgrade duration increased from 10s to 15s.
- 1-X-X upgrade cost increased from 200 to 250.
- 2-X-X upgrade cost increased from 300 to 500.
- 3-X-X upgrade cost increased from 1500 to 2500.
- 4-X-X upgrade cost increased from 3000 to 7500.
- 5-X-X upgrade cost increased from 10000 to 30000.
- X-3-X upgrade cost increased from 600 to 1500.
- X-4-X upgrade cost increased from 1000 to 7500.
- X-5-X upgrade cost increased from 2000 to 20000.
- X-X-4 upgrade cost increased from 2000 to 5000.
- X-X-5 upgrade cost increased from 5000 to 25000.

Multipurpose Engine:
- X-X-5 upgrade no longer increases attack damage.

New Tower: Ally Pawn ($250)
New Tower: Rainbow Beamer ($2500)

P.S.: Remember, if things are bugged or otherwise unusable (such as the prices being too high), report it in the comments! The more feedback, the better.

gBlimps:
- Size and speed have been adjusted. They are smaller and faster overall.

All Towers:
+ Improved targeting GUI for towers.
- Sell price is now affected by the cash multiplier.

Multipurpose Engine:
+ Reduced hoverballs' velocity by 90%. They should be much more collectable now.
- Base range reduced by 25%.
- All income generated from this tower is now subject to the Cash Multiplier.

Several balance changes:

Proximity Mine:
- X-5-X upgrade damage multiplier reduced from x20 to x5

Gatling Gun Knight:
- 5-X upgrade cost increased from 5000 to 10000

Orb Of Cold:
+ X-5-X upgrade now slows gBlimps.
- X-5-X upgrade no longer freezes gBalloons. Instead, they move 75% slower.
- X-5-X upgrade duration reduced from 15s to 10s.

New Tower: Multipurpose Engine

Hotfix for faulty Electrostatic Barrel.

Added bestiary.

Several balance changes:

Electrostatic Barrel:
Base range increased by 200%. Jumpspark distance unchanged.

Proximity Mine:
Base range increased by 100%.
Base cost decreased: 600 -> 500
1-X-X cost decreased: 500 -> 450
2-X-X cost decreased: 1000 -> 900
X-1-X cost increased: 450 -> 500

Orb of Cold:
Base range increased by 33%.
X-1-X range upgrade decreased: +50% -> +25%

Updated rotgb_tower_readme.lua to the latest revision.

Added a hard limit of 256 gBalloons.

Fixed targeting system.

Added ability to change targeting options.

Added new tower: Orb of Cold