I liked the concept.
Some personal notes:
The starting area spikes blended with the background made them hard to see at first.
I didn't realize the switching character thingy till i saw the controls, might wanna have an in-game popup
I tried jumping on the button to activate it based on how it looks and because it had collision, but once again saw the controls and then realized had to press e, having that popup would have also helped.
I would have like if each door was like a checkpoint. Its already hard with the right button disabled.
I personally didn't like the fact that everything respawned when nothing died. I mean "nothing can go wrong" so why punish me for it.
Sometimes I'd change from nothing to everything and accidentally move right, which felt like punishment if you went too far (under a platform that you needed to climb for example)
I don't know how this one could be solved tbh