This game is adorable! I like the difficulty options, concept and pixel art ^-^
I had a little bit of trouble with the jumping controls:
I had occasions where the character would be mid-jump and get stuck on the sides of the walls/crates/edges of floors instead of keep going up or falling down since the jump was interrupted. Also there were cases where they just wouldn't jump at all.
It wasn't that bad but it made me lose a couple of times so my timing got kinda bad haha >_<
Regardless of that little issue, it was a really fun experience, congrats on the game! \(^▽^)/