A simple platformer with some nice pixel graphics, there's some fun to be had here. There is one big issue I had, at it's core to this game: Key Bindings.
When the controls swap, it's sudden, there's no warning, there's no feedback. It's rather jarring. Not to mention that the control swapping seemed a bit buggy as some controls were just removed instead of replaced, there were 2 times where moving right was completely unbound. This concept can work, maybe give a warning just before the control change and see how this changes things!
Address that and you've got a fun little game here! Great work! ^-^