Cool premise. I like the art a lot. The biggest problem I think was already mentioned and it's that I brought the astronaut outside the screen and couldn't get hit by an alien. The scariest part is at the beginning when there's no time to figure out what you're doing and then one hit and you're dead., and I couldn't find a restart button so I had to refresh the page everytime. The true challenge is seeing if you can start the music AND dodge the alien all before the first one hits you. Good job!