Great Game, especially in the sound and graphics department, but gameplay is pretty fun too, besides the pacing (being pretty easy for a (to) long time and then overwhelming you all of the sudden), but, I mean, its a jam game . Aspect ratio of the web build is to high though. Couldn't get everything on screen.
PS: I forgot a small bit of feedback: the stars you can pick up to get upgrades could stand out a bit more.
PS2: Played through it a second time and I take back the pacing complaint. I think it had to do with the upgrades I took. Also the game is way more fun with the ion blast. Maybe you should have that from the start?