We had the chance to play your game! Awesome work!
We liked the minimalism of the aesthetics, and the Zen music worked very nicely. We enjoyed the whole playthrough of the demo and found ourselves kind of competing against each other to see who could solve it first :-D
It might be nice to have the level names displayed on the level. There was one time we wanted to replay a level but it was difficult to find. Also maybe there should be a "Back" button that goes to previous level instead of menu?
Great work, great game!