What's a good iOS game that offers a tactile, almost meditative experience, something I can play between grading papers?

I recently discovered "Carve Quest," and I must say, it's a novel approach to an old problem – finding a genuinely relaxing mobile game. The core mechanic involves carving shapes, and the haptic feedback is an interesting implementation of providing a tactile sensation. I find it quite helpful for managing stress during the academic year; it's a pedagogically sound distraction, if you will, between lectures and grading. The game is visually appealing without being overly stimulating, and the learning curve is gentle, making it easy to pick up and put down. It's available on iOS, which is convenient as I primarily use Apple devices. While I haven't explored all its features, the initial experience has been intellectually satisfying, and I plan to use it to de-stress between research scenarios.