Good job! The things I loved the most where the art style, the characters; the mini-tutorial was also a very good idea!
A couple of improvements I think that are necessary to point out:
- Like others have already said, there needs to be more feedback on hits (SFX when hitting enemies and visuals for the main character to be specific)
- The coin pickup SFX gets amplified too much when picking up multiple of them and hurts the overall enjoyability of the experience (I was scared of picking them!)
Keep it going :)