Super fun/compelling, very sharp visually! I'm sure I'd stay hooked for a couple hundred levels. The music is a little sleepy, but I get going for something low-key to fit the game vibe; I just felt over-lulled, like eyelids drooping, as I played, so maybe something a little more up-energy would be a better fit? There's something about the overall design in that vein, too, though again, I realize the meditative approach and can appreciate it – it's something that, for me, would make me put it down over time rather than keep on playing -- it needs some edges to offset the smoothness. Definitely high quality mobile play material. Very nice!