Neat little party game. For alpha stage it is stable, I haven't encountered any bugs or crashes.
Pickup boxes require some in-game explanation [and physics taming :) ], I expect it to be added later on, with improved HUD - like minimap or enemy's direction indicator.
Really nice looking FX, and I hope Main Menu will soon be overhauled to match graphics style of the game. I will definitely check it out again when it is in Final form.
Not many suggestions at this point, since it is still alpha, however, bump damage could be looked into.