Awesome job, didn't expect a ton from the cover art but it turned out to be a very nicely polished platformer! I was surprised at the size of the level and I don't think I ended up exploring everything.
The fight at the end was great fun but not sure if I could have failed it or not. The boss animations and firing felt very nice.
Your sound effects were great as well, nice and retro. Also the glitch effect was pretty cool