Cool, very nice job!
Love the atmosphere and the paralax scrolling :)
I'd have a few ideas for improvement if you want :
- short countdown (3, 2, 1, go) before giving control to the player
- score count somewhere (and max score for the session)
It's also pretty difficult :D which is not necessarily a bad thing, but well.. I didn't go very far =) Can't tell you how far without the scoring, hehe!