Potion Frenzy: Color Sorting Game

Potion Frenzy: Color Sorting Game is one of the Puzzle games here that asks for no download and no sign-up. Designed around touch input, and comfortable on a small screen. Listed under android, arcade, casual, color, coloring.

It is drawn for a tall screen, so it fills a phone held upright rather than a wide monitor. Everything runs client-side, so there is nothing to set up before you start.