The Usagi game engine is a free and open source Lua powered 2D game engine for Mac, Windows and Linux.  It's a mix of PICO-8, LÖVE and Dragon Ruby aimed at making games and rapid prototypes as easy as possible.  Looking for an easy to use 2D pixel art game engine, Usagi is about as easy as it gets.

*GFS Link* - https://gamefromscratch.com/usagi-2d-game-engine/
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Gamefromscratch

USAGI Engine is a new open-source, Lua-based 2D game engine that just hit its 1.0 release. Inspired by Pico-8 and LÖVE, it targets simplicity with a minimal API, a constrained default resolution of 320x180, and a single-sprite-sheet workflow. Installation is a ~2MB executable; projects are scaffolded with a single `usagi init` command. The engine features a live-reload dev mode, built-in pause menu, easy save system, shader support, and cross-platform export (Linux, macOS, Windows, and web). A Lua language server integration provides IntelliSense. The core game loop follows config/init/update/draw callbacks, making it approachable for beginners while still supporting shaders and custom tile sheets.

USAGI Engine - New Stupidly Easy 2D Game Engine 🕹️