Was this the specific "Alien Shooter" game you were looking for, or were you referring to the "Galaxy Attack" series? Your guide to surviving & prospering in Alien Shooter TD

Cryo units slow down fast enemies, allowing your high-damage troops more time to fire. Place them at corners for maximum area impact.

Used primarily to push enemies back. Always place them facing the enemy directly (not from the side) to maximize the knockback effect.

The game's auto-targeting can be inefficient. You can manually set a target for your troops to focus on high-priority threats like fast or flying enemies.