You need to destroy the enemies and collect power-ups to improve weapons. Game balance changes periodically, which makes the game unpredictable and difficult to get a high score.

Features:

- 100 waves of enemies

- 8 guns

- 13 perks

- 5 heroes to unlock

- 20 types of enemies

- 5 wicked bosses

- Only 1 way to escape

- Lot of factors that may cause troubles... or make the game easier!