Nice job on the game! Very ambitious.
3D game projects are always hard for me to judge, because I am less familiar with them. However, I think you made a solid game given the allotted time.
I enjoyed the core mechanic quite a bit. I could definitely see how you can make many different puzzles with it.
I did have some small performance issues, but it was probably my computer more than anything. I don't really have a powerful machine.
Overall, very impressive given the time constraints. Would like to see it further expanded upon.