A couple of nice projects I can think of are DragonRuby [1] - a 2d engine that uses SDL under the hood and mruby for its game logic. I created this [2] game jam entry in under two weeks of part time effort (has a few bugs but works)

[3] Sonic Pi - Music creation tool that uses ruby for instruction

[1]: https://dragonruby.org/

[2]: https://itch.io/jam/linux-game-jam2023/rate/2101760

[3]: https://sonic-pi.net/