Unfinished
#1 there seems to be little to no difficulty curve that rises as you progress
#2 enemy's suck and so does your chopper (perhaps a shop where you upgrade your starter chopper a bit as well as adding different chopper to grab)
#3 too slow paces for something like this speed it up a little.
also the music is annoying and the game sound could be turned down a little.
other wise a good attempt and a promising idea.