Not bad at all.
I quite enjoyed game myself. It's a tiny bit gitchy/buggy in the way you can fly across the roof, and your bullets fall down after you jump without moving, but I majorly ignored that.
Summary: A nice game. " It's added to my favorites so I'll come back for another play a little bit later. I'll subscribe to your flash feed. I give it a 7/10 and a "3/5 Hope to see more in future!
-Maccamuffin