I liked the game a lot, but I wanted to like it more. It looks very nice and for the most part feels good, but every so often it would feel like inputs would drop (this could be a webGL related issue) and the tolerances of spikes seems both really tight at times and also really loose. The third screen alone took me a while to figure out because of that and I think a more gradual difficulty curve overall could help out.
ALL of that being said however I did like it. The visuals, music, and sound effects are all very well done and when it feels good it feels VERY good and is a really solid platformer. I also really like the idea of having a gun that is used for additional momentum and it gives the player a lot of freedom mid-air.