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Before the the title screen, the save data prompt windows were cropped a little off screen, but immediately after everything was perfectly scaled within the 1280x800 frame. I see no visual glitches. Everything runs flawless 60fps with a perfect frametime graph. Controls automatically mapped perfectly. The game does have black bars due to being a strict 16:9 ratio. I have not found any methods to force a 16:10 ratio.
Default Proton was 7.0-2 at this time.
This seems to be a great candidate for the SteamDeck. I always wished this game came to my Vita, but this will do.