Surge Engine is a 2D retro game engine with an included Sonic-like game (Surge the Rabbit) for anyone who wants to make their own platformers like classic Sonic. The developers just released a big new version.
Read the full article here: https://www.gamingonlinux.com/2024/05/surge-engine-the-open-source-sonic-like-game-engine-and-game-gets-upgraded