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!