Red Impostor vs. Crew

Browser Hypercasual: Red Impostor vs. Crew needs a tab and nothing else. Taps and swipes are the whole vocabulary — a phone plays it best. Listed under action, battle, hypercasual, kill, killing.

It is drawn for a tall screen, so it fills a phone held upright rather than a wide monitor. Free to play in the browser, with no install step between you and the first round.