Theme: I think this fits pretty well. You get to discover the areas and how you can use your enemies' abilities.
Fun: I enjoyed this, but I found it harder than I would like (especially for a jam, where I'm playing and rating several games in a set time period). I like that when you lose a life you go to the beginning of whatever your latest screen was. But when you run out of lives you go to your latest checkpoint (the stone face thingy), and those are too far apart. Not sure which would be better, but one of these improvements might help: more frequent checkpoints, more lives, ability to regain lives.
Controls: There were also some parts that felt a little too close to pixel perfect jumps, which I can find really frustrating. I think part of the problem is that because you can travel so far with one jump, it can be hard to land in the right spot. (Not sure if this goes in fun or controls; I'm new to this rating thing.) It might help to allow spacebar for jump and/or to enable controller support. Those concerns aside, the controls worked quite smoothly.
Graphics: absolutely beautiful! I really love the artstyle (where did you learn?). A really good choice of resolution too: enough pixels that you can get some really nice details, but few enough pixels that you still get the charming pixel-art aesthetic. It makes the world feel friendly and inviting, like the world just wants to be explored. One of my favorite parts is the jumping animation for the player.
Audio: the music is great! The audio is chill enough that it doesn't make the player feel overwhelmed by pressure, but bouncy enough that it feels like the game is moving forward. It seemed like there might be different tracks for different areas? That's cool. The only thing this is missing is SFX.
Originality: even though the game is composed of elements I've seen many times before (adventure platform elements, puzzle platform elements, and taking enimies' abilities like in Kirby), it somehow still feels fresh and new. Perhaps because you combine things that I don't usually see combined.