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Typically shoot em' up games where the emphasis is dodging a large number of bullets on the screen at once. Bullets form dense patterns on the screen that require precise controls to avoid.

Near infinitely replayable games that usually feature, random generation, perma-death, and brutal difficulty. 

Games where the primary goal is keeping the player character alive under harsh circumstances such as dwindling resources or a hostile environment.

Unity is a game engine for 2D, 3D, AR and more