Hey, there is no story. It's just you, a miserable soldier stranded on
some alien planet, doomed to die. The only question is, how many of them
will you take out before you meet the Grim Reaper?

There are two main game modes.

- Career -- the main one -- is you against an advancing horde of aliens. You
can pick up power-ups, weapons and perks in this mode. Goal: to have the
highest experience point counter possible.

- Survival is you against a flood of aliens, nonstop. You have an auto-rifle.
There are no other weapons, perks, or power-ups. The goal is to survive as
long as possible (measured in seconds).

- Level Test is a hidden mode, that has you going
through four levels, fighting baddies. Once you beat all four, you loop back
to level one. There are only a couple of weapons available, and perks.