If you walk 18 frames right, you'll stand on the edge but won't be able to jump :/. Also, it's almost impossible to tell if commands were executed or not, and the behavior for when a command doesn't work is unclear: does it skip a frame and do nothing, or does it go down the list of commands?. Having a frame by frame play option would be nice to see them in action. Moreover, the little monster doesn't reset when you press play, so it makes the whole level even more unpredictable.
Edit: input => command