Physics are great, but man do you die fast...
This was actually a fun game to play because just watching your little helicopterget knocked around was fun unto itself. Aside from this games awesome coding, just a couple of small suggestions though:
-Make the game a little easier in regards to the upper part of the sky; why should I get owned by the sky? Maybe get brought down, but not take damage.
-Have different music playing each level, gets a little repetitive.
-Why couldn't the helicopter switch directions depending on the direction you are facing?
Overall the game is pretty fun, and challenging. Keep up the good work!