Good game, I liked the simplicity and the levels, great ending too.
Some feedback comments:
The jump mechanic was pretty hard to master and it might cause you to abandon the game at the very beginning (at least in my case).
Also on some levels, the audio is being played on the "left" speaker, I would assume that the AudioStream2D used by Godot is placed always on the left of the screen and causes that. (I learned this while doing my game too, ref: https://godotengine.org/qa/72837/how-do-i-enable-stereo-audio-on-a-project-solve...)
Anyways fantastic result for a jam, keep it going!