The graphics and music work well together. It's really cute! This could turn into a really fun puzzle platformer I bet. I also like the tips flowing by in the background, nice touch. I had the 2nd checkpoint 2nd jump issue as some others had. Since you're using Godot, you may want into "physics delta."
I will link a question with an explanation below:
(This may be a bit out of date.)
https://www.reddit.com/r/godot/comments/isl1yn/comment/g58kyo2/