Bloxel

Bloxel is a flood-fill puzzle. You pick a colour, your flooded region grows into every connected tile of that colour, and you try to clear the whole board before the moves run out.

Absorbing lots of tiles in one move scores more, so the game is about planning a few moves ahead. The levels never end, and the difficulty quietly adapts to how you play.

It plays offline, saves progress on the device, and every move has sound and haptics. It is free on the App Store, published by Digital Vibes.