I noticed that you'll sometimes get a level with platforms that are just plain impossible to reach, but given you can instantly it's not a big issue.
I also feel the menu is pretty unnecessary. It even kinda breaks the "WASD/Arrows only" limitation by requiring the Enter Key. If it had a "Press any Key" prompt to reset I feel retries would go smoother. (Also having the exit button in a browser game feels... odd)
That out of the way, the physics here are pretty fun to mess around with and the music is pretty neat! It would be neat seeing this expanded with more obstacles.