It does run on steam deck. I had to switch to proton experimental, and the graphics have to be toned down a good bit for 40FPS stable, but because combat is turn based, it won't get you killed. It also handles reasonably well with a controller. It has enough complexity that some stuff takes more than one level of menu to do, and I've made some mistakes due to the differences with their control scheme for Divinity Original Sin 2, but once you get comfortable with it I think it works pretty well.