Just tested it (alone). Looks very promising so far, good job! What I really like is that you can fly in a curve around obstacles if you have enough jetpack power.
The weapon handling looks pretty solid, too, however they should lose some accuracy when you are walking/ running/ flying (esp. the sniper rifle always hits dead center even when you are moving sideways).
The grenades could be made shootable, too.
The default walking speed is a little low.

All in all a game with much potential, I would however focus completely on the multiplayer experience and only add botmatches as a singleplayer option.