Old game that I accidentally unshared, mb You use the numbers at the top of your keyboard to change your character because some are better suited for certain levels than others, arrow keys to move. If you use 2, you would have to jump up before switching to it.
I got the platformer script for movement from the youtube channel McGuy. edit: coming back after a year or two, definitely needs a photosensitivity warning so yuh one level has flashing lights