This is an incredibly interesting idea, and something I'd love to see explored in a longer game. The bullets can't actually hit you unless you run into them, and it took me some time to wrap my mind around that. Well done!

Wow... really interesting concept, think you might have struck gold on this one!

Music was stellar, and never got old even though I had to do the third level a whole bunch of times. 

Might want to add a bit more polish on the platforming side, a game like this would really appreciate a little bit of coyote time.

Overall a great effort, would love a full game made with this mechanic!