The concept is very good and I had fun with trying to figure out which shape is the impostor. Unfortunaetly the boxes fell outisde of where they belong to be quite often which hurts the experience. As for the conversation you start with my teammate SabifiedSab, I personally think you should keep the physics, because they give this bit of movement and let the game live a little more. ( I am bad at expressing myself XD)
You would have to fix the falling over though.
All in all keep the good ideas going in the future. 👍