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Games that feature 3D art that has a low polygon count per model. Generally used as an artistic style.

Featuring aesthetics, gameplay, or themes reminiscent of classic video games. Often characterized by pixel art, chiptune music, or mechanics popularized in earlier gaming eras.

Science-fiction. Commonly including things like aliens, advanced technology, and settings of outer space or distant planets. 

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