This is a really nice feeling game. I'm not very good at it, seems like I always end up with some nodes on their own little island. Highest I got was 96%. I think if you added some juice like a pulsing animation to nodes, maybe "beating" to the rhythm of background music, this could be a really cool relaxing puzzle game. Also, I'm not sure if it would work- but I think the controls could lend themselves well to mouse click + scroll wheel to select and rotate the rings. I think that could feel a bit more intuitive than the keyboard option. Actually, now that I think about it, this concept would be perfect for the Playdate system which has a crank. Some food for thought!