Interesting concept
This game is a fairly good balance of difficulty and innovation. A little more explanation as to what exactly you control would be useful. I didnt realize I didnt move the battlecopter. Having said that, I havent beaten the game, but one life with no powerups makes this more of a survival game than an arcade run n gun. Not sure how long the game is but if it is longer, would be nice to see either multiple lives or health drops at some point, since the game does eventually increase in difficulty.
Aside from that, I thought everything else was well done. I liked the variety and consistancy of attacks, it felt challenging to play, just wish I had survived a little longer to enjoy it. The music I also enjoyed, seemed to fit the atmosphere very nicely.