Endless waves of enemies that grow stronger and more numerous the longer you last. You steer your character from a top-down view, dodge attacks and shoot back with your rifle to stay alive.
Between the waves you pick from a set of random upgrades, and every choice bends your run in a different direction: more damage, extra effects, or simply a better chance of surviving the next minute. Your character and your enemies grow in step with each other. A difficulty level is chosen before each run, and every run ends with the option to put your score on the board. The pace is fast and demanding — keep moving, keep your positioning clean. Simple rules and a wide spread of upgrades make it work for a quick session as well as a long one.