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Typically refers to a style of game where a player's ship can rotate 360 degrees on a 2d plane and is responsible for shooting and destroying on coming asteroids. The asteroids start out large, but divide into smaller obstacles as they are damaged. The game becomes more difficult and chaotic as asteroids are broken into the smaller pieces.

A perspective where the camera is placed directly above the player. Common in 2D games, but can also be used in 3D games.

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