Despite being short, and bland, it runs soooo smooth, and the sprites just look right when they squish or stretch.
Word of advice: make the enemies short rectangles _ instead of tall | since it's kind of hard to hit them, and they kind of look like the pillars that would kill you.
Other than that, I'd say look into more copyright-free songs, since the one used is, kind of overused.

Nice

Good game, but it's really short.

Can't clear the second jump in this stage. Did you accidentally make the game impossible to finish? Or did you not include a prompt for a run button?