It is fascinating and a huge step, but I want to keep expectations low. It will work, but it will not be as compatible as x86 Proton, not at all. It is first and primarily an OS for streaming games and running VR. That is the VR rendering from the streaming computer, not the VR game itself. In other words, they only had to get exactly one app to run well enough for public use. According to the developer, it is working with a surprising amount of games. I agree, one game is surprising, but trust me when I say you will not be running Windows x86 games in ARM Linux for a long time.