Really good concept ! Basic (of course, it's a 50h jam ^^) but efficient ! It fits the theme perfectly and I can see it being expanded upon with different shapes and dices.
The visuals are clean and the goal is easily understandable. The controls are a bit confusing, maybe you could remove the Y axis rotation (that you can obtain with a X/Z/-X rotation anyway) and keep the classic WASD controls : during my first plays, I only used WASD because the other buttons felt unintuitive, and I found it more enjoyable that way (a bit more challenging ^^).
Overall, that's a neat game, congratulations =)