It's a fairly well made platformer. The artstyle is the best part.
I do have a few nitpicks:
- If you hold down the left mouse button, the character holds the punching pose and damages enemies on contact.
- The enemies get a bit boring after a while since it's always the same type.
- For these sort of exploration platformers it's a good idea to have some background elements act as landmarks. Maybe there could be some sort of unfinished sketches in the background of areas with branching paths so it's easier to remember.