Cool game, too bad it didn't have any sounds, if you don't know how to make sounds I personally used a generator which helped out a lot https://sfxr.me/. It can be kind of confusing to figure out what you're supposed to do, maybe zoom out the camera a little so you can see the big blue enemy blocking your way before he actually blocks your way. Maybe add some checkpoints because it's quite annoying when a laser hits you at the end and you have to go through the whole level again. Took me ages to figure out what to do about the big blue enemy and when I finally got past him, it took me ages to figure out how to get through all the lasers so a checkpoint when you go through the door would have been nice.
Overall a nice game. Would be nice if you could check out mine.