On a phone, the interface is cramped and precise placement is difficult. Definitely a desktop (mouse) experience.
You can build Rube Goldberg-like machines, simulate weather, grow forests, trigger explosions, or just make pixel art that moves. The “save/load” feature lets you share creations.
Elements have distinct, satisfying sound effects — crackling fire, splashing water, crumbling sand — that add immersion without being intrusive.