This was really fun.
The 3D elements added depth to the game, figuratively and literally. The way you blended the 2D puzzle platforming with rotating space and perspective shifts was really well done. The gravity/room rotation mechanics felt clean, and you used them in some smart level design setups.
It never felt gimmicky either. The mechanics actually mattered and made me stop and think about how the space connected when rotated.
Combined with the perspective switching, it made for a really awesome experience. Also, love the title screen.