When placing two identical units together, give one a slightly lower-tier weapon. This causes them to fire at different cadences and often at different enemies, reducing wasted DPS and retargeting time.

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

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.

These are essential for late-game survival. Place them at the very start of the enemy path to strip armor before they reach your other units. Focus upgrades on "damage to armor" first.

Use these for long-range support against flyers or slow, high-health armored monsters. Tactical Combat Tips