The art you are going with is very good and smooth animation, tho I can see you didn't had a lot of time for it. It's a nice shooter tho I think the endscreen is broken? I always got the same outcome, at first i thought it was highscore but I am sure I did more than 2 waves.
Also what do the buttons do at the start? I don't know if they did somthing.
Overall nice game looked promesing.