Characters (Mechs)
There are four types of mecha and pilots, and only one, Thunder Strike, is unlocked by default. If you clear the game with Thunder Strike, the next mecha will be unlocked, and so on, one by one. I have only unlocked 3 at the moment but I'm working on it

Sif


Thunder Strike
You can choose from the beginning. The special technology is negative particles. As time goes by, the value increases by 1 and can be accumulated up to 20. When a special skill is cast, a special barrage is deployed forward at the same time as the accumulated number. The pilot is a Thief, and as the level increases, passive abilities corresponding to Thunder Strike are unlocked. Similarly, future pilots will also gain passives related to the mecha, and a dialogue window will appear as their level increases.

Rita


Abliterate IV
It is automatically unlocked when you clear the game with Thunder Strike. The special skill is carpet bombing. A missile bombardment is cast on the front, and most of the minor mobs as well as high-level mobs are killed instantly when hit by the missiles. The missile's damage increases depending on the main gun's attack power. The pilot is Rita.

Alicia


Storm Caller
It is automatically unlocked when you clear the game with Abliterate IV. The special technique is Kinetic Cut. It propels forward quickly and fires a shock wave. At this time, it pushes away nearby enemies and inflicts damage. Unlike other skills, there is no cooldown and consumes energy. It is the most powerful of the aircraft with a simple but powerful effect. The pilot is Elysia.


hermes
It is automatically unlocked when you clear the game as Storm Caller. The special skill is Ball Lightning. When a special skill is cast, ball lightning is installed at the location. At this time, if you detonate it with your main gun or if an enemy detonates it, it explodes and causes damage to those around it . The pilot is Cecil, but in the Korean version it is translated as a strange name, a man's name. However, in the achievement window, it is displayed as Cecil.

The main weapon is the weapon that the mecha will be equipped with when it sorties. You are given a decent basic gun at the start, and even if you clear the mission or fail, you can purchase it with funds earned based on the number of kills.

Standard rifle
It's an okay gun to use briefly in the beginning. The damage is as low as the secondary weapon, so it may be better to upgrade the secondary weapon rather than upgrade the main weapon.

Assault rifle
A reinforced version of the basic rifle. Damage has increased noticeably. Instead, ammunition and shooting speed were slowed down. Likewise, it is a weapon to be used briefly and then discarded.

Reflex rifle
After hitting the target, it bounces in a random direction only once and causes additional damage. Since the upgrade increases the number of weapon penetrations, this can further increase the number of cushions. The damage is decent and the ammo is decent.

Magnetic rifle
Guided Rocket
It is a weapon that fires guided rockets. The original text is a guided rocket gun, but guided rockets are just missiles... The in-game missile guidance performance is transcendent, so it's not a bad choice if you want to ride a missile build. Instead, it is backward compatible with the sniper rifle or the charge gun described later.

Charge gun
It's similar to a sniper rifle, but this one fires energy spheres instead. There is no limit to the number of penetrations, and targets that touch the energy sphere take damage. Similar to the sniper rifle, if you use the main gun build, it is very strong at killing bugs.

Special skill upgrades
When you defeat a boss, you absorb all the experience beads that fell on the map, regardless of distance or number, and if you pick up the chips dropped by the boss, the unique special abilities of each aircraft are strengthened.

Advance system
You can upgrade with the funds you earn after the game is over. There are 21 types of upgrades in three systems: attack, defence, and assistance, and all can be upgraded by clearing the game 2-3 times on the highest difficulty level. There is Hp upgrades, More Crit DMG, theres quite a few here.



Agile chip
When you kill a boss, it drops 1-2. There are 40 options to unlock with this chip, and you can select 5 to apply. Some are good buffs
In some cases, instead of a fatal penalty, there is a huge buff. Depending on what you are carrying and what aircraft you are carrying, you can ride in various builds.
There is so many to list but here is a preview.



Maps/Levels
There are three types of terrain: desert, moon, and tundra. Clearing the desert unlocks the moon, and clearing the moon unlocks the tundra. The bosses that appear in each terrain and the climate abnormalities that appear when bad weather is turned on appear differently. Typically, in the case of desert maps, bosses and mobs such as spiders and scorpions mainly appear, and sand storms blow.



Air drop
Airdrops are the concept of supplies that drop during the game, and there is a bonus for each airdrop. As a side note, there is an achievement for clearing the game without using airdrops.

Killing fields
Destroys all mobs on the map. Among all air drops, it is simple yet boasts a powerful effect. Not applicable to bosses

Ice field
Stops time for all mobs on the map, including bosses . Instead, if you go near a mob, time will stop and you will still take damage.

Boost
Sets the aircraft's energy to the maximum and prevents all energy-consuming actions from consuming energy.

Invincibility
The aircraft does not receive damage when hit.

Aerial Bombardment
Missiles periodically fall from the air around the aircraft.

And everyone's Favourite Magnet
Absorbs all experience beads on the map.

Difficulty
After clearing the game for the first time, you get used to the game and it feels quite easy, so the difficulty correction is unlocked each time you clear the game. If you kill this, the difficulty increases quite a bit, and there is a Steam achievement for clearing each map at difficulty level 9. For each difficulty level added, the reward increases by 10% when clearing the game, and if all difficulties are beaten, the reward is doubled by +100%.

• 1. Impregnable Mode: All enemies’ health increases by 25%.
  
• 2. Hidden threat: Mobs that are stronger than all other mobs. The proportion of mobs with higher physical strength and special abilities such as long-distance attacks, assault attacks, and self-destruction increases.
  
• 3. Disaster weather: Unique abnormal weather phenomena often occur in each map.
  
• 4. Final measure: The number of mobs created increases dramatically.
  
• 5. Fast as lightning: The movement speed of all mobs increases by 25%.
  
• 6. Unlimited Power: Damage received from enemies increases by 25%. The Korean version says that you deal 25% more damage, but this is an obvious translation error.
  
• 7. Double function: The number of bosses is doubled.
  
• 8. Indestructible: Elite mobs enter Berserk state when they survive for more than 15 seconds. Speed ​​increases by 15% and deals 50% additional damage.
  
• 9. Survival Challenge: The number and rate of elite mob creation increases dramatically.
  
• 10. Endless mode: The game does not end until you die. In other words, it is impossible to clear.

Helpful Tips
The most welcome options in early mecha upgrades are increased survivability or the addition of secondary weapons. If you have an OP-level primary weapon such as a sniper rifle, upgrading the primary weapon, especially increasing the primary weapon's ballistics, is also welcome.

Mecha has energy levels. When using a boost or in the case of Storm Caller, there is no cooldown as a special ability, but it is activated by consuming energy. When all energy is consumed and becomes 0, the aircraft enters an overheating state and cannot take any actions that could consume energy until the energy is restored to 100%.

Pressing the space bar enters the boost state. At this time, you can push away nearby targets and ignore most melee attacks except boss-level monsters. Instead, the energy consumption is very high, and long-distance attacks cannot be avoided if you are within the range of the long-distance attack, even in the boost state. Also, during the mecha upgrade, if you do not press the option that allows firing the main weapon during the boost, the main weapon cannot be fired during the boost.