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Godot Engine - The free and open source 2D and 3D game engine

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

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.

Taking place after a huge catastrophe (eg. man made or natural disaster). See also the more political theme dystopian.

Unreal Engine is a 3D game creation tool

Voxels are small geometric primitives used to construct larger worlds. Sometimes called 3D Pixels, they are typically cubes.