It seems to be an Unreal 4 engine game. I tried the demo and had mixed results. I’ll write about it later when I have time. I started with a copy from Mordhau profile, but I can’t remember what more I did.
You’ll need to run the game in dx11 mode though, buy adding the -d3d11 launch option in steam properties.
sorry for my mistake, I remembered it was developed with unity, instead it uses unreal engine 4. on the cloud I uploaded the profile, starting from a copy of Observer.