The past 2 months I've been working on moving away from Unity. Over the years I've made a lot of editor tools for use in Unity, and I found that Godot didn't really suit my project, so I decided to make a custom engine that has all the runtime features that I use in Unity, and to which I would export my game to instead of having Unity build the project's executable as normal. That way I could keep using the editor tools and overall familiarity of the Unity Editor for my current project (Wormentum), with some side benefits like performance improvements (at least I expect so).
The engine I'm making is built on The Forge: ConfettiFX/The-Forge: The Forge Cross-Platform Rendering Framework PC Windows, Linux, Ray Tracing, macOS / iOS, Android, XBOX, PS4, PS5, Switch, Quest 2 (github.com)
For full details you can watch this video: