I love the aesthetic - especially the chalk board font with instructions - it looks very polished.
The camera controls take some getting used to - I kept trying to use the middle mouse button to pan or do 3d axis rotation... you may want to look into standardizing the camera controls to make them a bit more immediately familiar; however, this is a small thing.
I didn't get through all the levels, so apologies if it's a thing already, but I think a cool addition would be some obstacles like you'd see in a mini-putt course.... windmills, etc.... but ones more suited to Gravity golfing of course