The air mechanic does not add any fun to the game. I think more then anything it was an afterthought or just a good intentioned idea gone wrong. I can see you were trying to add difficulty to the game but that mechanic just makes the game frustrating and does not add any real value. It is almost like a separate TD build in to the real game.
Great game otherwise.
Two tips. If you want auto fire just hold down z and then click outside of the game, there is your auto fire.
If you want easy money get to level 24 back up as far as possible and just sit there. You will get hit once or twice but you will get 850 cash every time with out dying.
Up to let others know.
Trying to jump and just sitting the ground and running in to a blade is really annoying. The user should not have to adjust how they play, you should adjust how you make the game. You should know hardware limitations on most keyboards means that you can only press X keys at once in a certain area.
Also it is annoying that you can make a jump in slow motion fine but when you dont use slow motion and do the exact same jump you die...
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