Worked out of the box on the deck
Reviews on the game are mixed, so I think it might have some bugs that aren't related to playing on Linux. It's also not listed as having cloud support, but on a quick test between the deck and my desktop PC, cloud saves worked.
No modifications necessary.
Depends on your WM. switching from non fullscreen to fullscreen is a little buggy. Workaround for plasma 6: You can get around this by enabling fullscreen in game, disabling fullscreen on plasma 6, resizing the window with meta right click, then re-enabling fullscreen on plasma 6.
Steam's rating on the steam deck not working with this game is inaccurate. At least on desktop linux, this game runs pefectly. I do usually have games default to proton experimental, but to check to see if players can play with no modifications, i switched to proton 9. Works fine on experimental and proton 9. No arguments or modifications were necessary, as expected from a super light game with no anti-cheat.