Not a very good game at all.
Glitchy as hell, physics suck, weapons are inappropriatly named (Rifle? Give me a fucking break), the height you die from falling is about 15 feet, and grenades don't appear to be matter, judging from them flying trough walls of all kinds.
There's this little thing people do before releasing a game: They TEST it. Next time, actually make sure things work! I can't get past level two because I keep bouncing (literally) off of walls, and dieing from the fall.