Cool concept! Switching between gravity + 2D/3D to solve puzzles feels really cool, and it bring a lot more possibilities of how to solving it too!
My personally, the BGM is a bit too intense for me, and it feels a little bit “looping”, might make it feel more quickly to start get frustrating, maybe a calmer one would better too!
Anyway, It’s a really good idea! And the execution is great too! Great Work!