Tic Tac Toe Immanitas

Tic Tac Toe Immanitas is listed here under Hypercasual. There is no launcher and no install between you and it. Taps and swipes are the whole vocabulary — a phone plays it best. Listed under 1 player, 2 player.

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.