Really interesting concept, I liked the concept on changing shapes based on perspectives. Also low-poly graphic style looks pretty good, and it matches with the concept of this game I think.
Unfortunately, the falling through floor bug was so critical that I gave up on 4th stage. I see you are using unity engine, so if you are using rigidbody for character, try changing collision detection mode in rigidbody from 'discrete' to 'continuous'.
I would like to see this concept being expanded in the future, nice job :)