I won!!! I loved your game, it's really a gem of game design!
The puzzles are great, the interactions are very original, overall I am really impressed by the experience!
To me this is a very strong proof of concept, if you have plans for the future I would have a few advices. You for sure are aware of the lack of visual art, audio cues for progression, and this kind of high level feedback. On top of this, I would advise you to do some great UX improvements : having visual links between a button and the object it affects, showing that some buttons interact only with the cube or sphere by having some kind of slot where the shape has to go... etc!
Congrats again, you deserve it!
