Gameplay: Kill all spammers. Survive 25 waves and win, or compete other players
in Survival mode for longest survival time.
Sound and blood splashes could be turned off.
Different types of enemies and allies.
Four types of bonuses/powerups.
Five types of "bad bonuses".
Seven weapon types.
Two play modes - Survival and Waves.
In-game pause and pause when mouse out of game screen.