This is a very fun little game. Single player, the bots become a little too easy to mash, but the levels are fascinating, the mechanics of the game are innovative and different. The graphics are very simple, and ensure that you're not having that modern-game problem where you didn't see an enemy coming because of the foliage or mental textures.
The only thing I'm not overly keen on is the shallowness to the play. There doesn't appear to be any tactics, or good spots to learn, etc.. Wherever you are, and whatever you're doing, it all comes down to: Who can spin around and attack first. Because you spend so much time in freefall, and that the enemies have auto-lockon, it sometimes feels that it's just a click-fest.
That aside, it's whiled away many fun hours, and I've enjoyed all the levels (I think)... If you want to have a LAN party, and need something light to fill a while between heavier FPS sessions, this is a very fun little game.