Great animation, and nice job on the gameplay! It was a really interesting and fun game, I had fun for a good while! The animation/drawing of the helicopter and the soldiers was nice, and the background was also good. The bombs were cool, but I didn't like the random bomb spawning (when they're coming from the side on level 13, I believe. The tip is "you're gonna die."). To make it a bit easier, maybe you could make the bombs only come in a single pattern (in one level, of course).
The second thing I think might've made the game a bit too hard is the wings of the helicopter. Not the animation, it was great; but maybe next time you could set it to be so that you only get blown up if the body of the helicopter, not the wings, touch the bombs?
Overall, though, great game. I'm looking forward to the next one, great job! :)