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Games in which the player shoots things to progress, usually with a variety of guns, and other times with bows and arrows.

Pixel Art refers to the charming, simplistic, retro/renaissance style of very-low-resolution graphics, such as from the 1977-1995 Atari, GameBoy, & Super Nintendo (SNES) eras.

For that old school look and feel.

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