Reaaly nice but...

ok i guess i mean kinda pointless but something to do. Mabye a difficulty mode should be cool. Plus put more effort into the graphics. other than that really good. gaaaaaaaa i hate that ballon

Good concept but

your game starts rather abruptly without much control advice, so your left pressing random keys to see if they work, after you relize the baloon will always shoot at you, so your always moving, and the factor of you having to use momentum to hit the airbaloon was rather good,
graphics could have been better with the explotion, and maybe multiple levels added so you could shoot down zeplins or fighter planes,

good game just needs some work and you could go far with this concept =]

Yeah.

Surprisingly I loved it!
:D A replay button would be nice though, and a simple score :)
It's nice, simple, but fun.