Just a few suggestions.
Make the sound effects lower than the volume of the actual music, wall jumping just interrupts and it feels awkward.
Since the art style for the game is pixel art, I would strongly recommend MortMort, he's really helpful and has a handful of tutorials to help you.
I feel like a tutorial at the beginning would be better and text below the start screen saying "Press To Enter" or something, because I was a bit confused at first.
Overall, it's slightly better than most games here, good platforming and more.
3.5/5.