to retry the level you simply press R
however after you jump, avoid going to the blue flame right away, go up then push the rock down and finally go to the blue flame
if you really don't know how to do it, there is a gif on the itch page of the game
Man I really enjoyed the level design and the puzzles you came up with! But at the end of the on/off switch level I mistakenly touched the flame again and had to do all over again. Also some platforms (the stone ones) blends in with the background and some background tiles looks like solid objects. Maybe next time try to distinguish them better! Anyway really love the idea and the game overall and the camera work is neat!