It feels good, looks good but the throwing mechanic is getting me kinda frustrated and makes the puzzle solving annoying because you can't really choose the number you want, which is the expected effect i guess but for a puzzle game like that it is a bit annoying. Also since you're using unity check the "use physical keys" buttons in the project settings in the input manager, takes 2 seconds and makes people with a non-qwerty keyboard like me less of a pain. excellent level design and mechanic, great game overall, good job !