My credentials - I beat Celeste that one time lol. Nice platformer entry to the jam - I'm glad to try it even though I did not get all the way through. I think you did a good job integrating the theme and the art and sound. The levels changing up was very interesting, and the initial story of the character being tired of collecting the same gems was also a nice touch.
I like that there were a few anti-frustration features like a quick respawn, and if you got the gem, you could just make it to the end instead of doing everything in one go. People have mentioned the controls - I did think the character was a touch too sensitive and the variable jump height was particularly tricky for me to get with a keyboard press. But I think I would have made it farther if the tops of the platforms weren't so slippy, especially on the rotation and angle levels. There should be a tiny bit of traction so the player can accurately judge the next jump without falling off