Dev note from FingerofDoom, our one-finger tap roguelike for phones.
We wanted crits to be readable in a split second, so the rule is one sentence: a critical tap does double damage. A normal hit of 4 becomes 8, and the bigger number tells you at a glance.
Clip: a rogue run from floor 3 to 6, ending on the shop's stat panel (CRIT 15%).