Godot, Unity, Stride, Flax and even jank niche engines like NeoAxis generally have pretty good C# integration!

If you look more at Stride, you’ll see that even their physics engine is C# which is insane in the best possible way: https://doc.stride3d.net/4.3/en/Manual/physics/index.html and https://github.com/bepu/bepuphysics2

Very cool language and as much of a mainstay in gamedev like something like Lua.

It surprises me that Java never got similarly big despite their GC improvements, though jMonkeyEngine was a nice project last I looked.