If you like Portal, then this is the game for you. Quite well done and easy enough to solve without frustration.
Playability is really top level here.
Couple of minor problems/possible improvements:
- There is a light dot that is always visible on the center of the screen. It seems related to a far away mesh that is still emitting light.
- Some part of the room are not perfectly aligned and show not connected lines between them.
- The "hand" should be a little bit more far away from the camera. The picked up dices are quite too close and make difficult to see around.