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Uses two-dimensional "sprites", 2D images created and used on a flat plane, as opposed to the three-dimensional models or environments found in 3D games.

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

Resources relating to or for building Graphical User Interfaces (Commonly called GUIs)

Typically small graphics that can be used to represent something, like items or actions

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.

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

Unreal Engine is a 3D game creation tool