I really like the game play mechanic, it makes for a really interesting PROTOTYPE. You really should develop this out further and make a finished game with it. Despite its complete lack of polish and such, there are 3 bugs that I have found with the prototype.
1) Bombs always point towards the right, even when they are moving to the left.
2) The helicopter always faces to to the right, though this might not be a bug, I think it looks awkward especially in the later levels when youre moving to the left a lot. I think you should make it so that the helicopter remains facing the current direction, even while going in reverse, until a certain speed in that direction is reached and then you should flip the graphic.
3) Its really annoying when I blow up a wall but there is a tiny piece remaining that I continue to collide with. To fix this you should either set it up to check for small bits and delete them or if you dont want to do that, possibly have a way to detect that you are running into a extremely small piece and have the helicopter destroy it on collision.
I know I have critiqued a lot about the demo, but thats only because I REALLY LIKE IT. Its an awesome mechanic and im sure you could pull of some really cool stuff with it. Good luck, im looking forward to your game based off this. :)