I really like your Game! The spritesheet was used very good too, there are two things i would change, i would use A and D for movement and Space for jumping as it feels more natural, but thats just personal preference, also it would have been cool if you had added some Sound effects (e.g. with jsfxr). I was astounished by the Cutscenes, they looked very clean and Professional. I think some Enemys and Music would have spicen things up, overall i think your game is great. Continue what you are doing! :)