Hello!
I released a 3D game engine.
https://rubygems.org/gems/blue_kitty
I've been learning Vulkan in the last months and using this knowledge to build this Ruby. It's incomplete now, but I intend to keep working on it until it becomes a reliable project for professional game development. I encourage anyone that wants to help or is just curious to follow it on Github: https://github.com/fredlinhares/blue_kitty.