After 10 minutes of digging I managed to find one single screenshot of an actual game built with it. Isn't that the first thing a developer wants to see?
https://unity.com/ leads with demos.
https://kaijuengine.org/ leads with a block of text claiming it renders cubes faster than Unity.
It says on the home page it’s under development. I wouldn’t expect any games made with yet.
> The engine is not released and is under heavy development.
What does a screenshot of a game tell you about the engine or the developer experience? If you can push triangles and run shaders you can render anything.