Nice platformer, the movement feels a bit slide-y and can be a bit hard to control, but I don't think that takes away from the experience. I thought the gun shooting wasn't working at first, since there's no sound or visible projectile, but eventually I figured it out. The graphics, sounds, and music used were all well selected too.

I did find a bug, that the level doesn't reset when the player dies or falls off the level, so opening the menu and restarting the level is the only way to continue, which was a bit annoying, especially when there's some tricky jumps here. All in all, good job on this though!