Godot engine is fully functional on the switch, but it needs to be compiled from source. Raspberry pi builds don't work due to some kind of version issue.

In short: sudo apt-get install build-essential scons pkg-config libx11-dev libxcursor-dev libxinerama-dev libgl1-mesa-dev libglu-dev libasound2-dev libpulse-dev libudev-dev libxi-dev libxrandr-dev yasm clang

Edit /usr/bin/scons so the shebang says /usr/bin/python3 instead of Python

Download godot tar.xz, I did godot 3.5.2 https://github.com/godotengine/godot/releases

Extract, change to directory and do scons platform=x11 target=release_debug tools=yes use_llvm=yes CCFLAGS="-march=armv8-a+fp+simd" arch=arm64 -j4. Instructions taken from https://github.com/hiulit/Unofficial-Godot-Engine-Raspberry-Pi/blob/main/compiling/raspberry_pi_4.md

It will take 2 hours to compile. use_llvm is required, g++ has a linker error. I tested debugging games and clicking around and there were no issues, but I didn't test it super extensively. It seemed to handle GLES3 perfectly.

Or alternatively a download for compiled builds can be hosted, but I don't have anywhere to host builds.