Yeah, Exzap said on Patreon that this build wasn't aiming at compatibility, there's probably no new games working.
My observations on Mario Kart 8 with 1.5.3: Looks better than before, but what's kinda weird: The loading times for the title screen and before a race have gotten even longer now. However, when I play grand prix, the loading times for the second, third and fourth track are much shorter than before
While my general performance in races seem to have stayed the same (full speed) I think I noticed more stuttering. Before, the first lap was always stuttery (shader cache generation) but from the second on it was mostly a smooth ride. Now there seemed to have been some stuttering here and stere, maybe VRAM having issues shoveling textures around efficiently or something.
Super Mario 3D World: Looks strangely fuzzy, especially on the world map. I don't know why, I don't think Anisotropic Filtering would do this. Looks a bit like super-heavy FXAA.
And a tip for everyone having issues with mapping their XBox One Controller, do the following:
Enter input settings, disconnect controller, exit input settings, reconnect controller, enter input settings. Now you should be able to map everything without issues.