Super cute game! i really like the art work and the way you've animated the player character :-)
a couple of friendly and constructive feedback to improve this game or the next game you're working on:
- Jumpcut and coyote time would improve the platforming a lot.
- the hit animation (color flash) could be more punchy and faster, this would add more readability and the feedback would fit better to the action.
- add a short fade in and fade out when you switch or reset scenes.
- make the monsters more readable and try to take care that they are also visible when they are behind foreground objects (with an outline or a single fill color).