
I played through the game without problems, only issue was that the game froze after finishing the credits. Windows solved this temporarily.
the fps changed to unlimited on each startup when choosing 60fps instead of Vsync
credits issue happened to me on Proton experimental and v9

Any reported proton version that people say works doesn't work, at least not anymore.
DXVK_FRAME_RATE=60 %command%
Can't launch at all
TDP: 9W
Didn't have dialogue audio on the first run, restarting the game fixed this.
DXVK_FRAME_RATE=60 %command%
Didn't experience any issues on proton experimental but, As mentionned by others, the game crashes when reaching the end credits, locking you out of the post-game.
Use GE-Proton7.49 of higher to work around the end credit crash. Disabling SteamCloud saving temporarily might also help.
Works great out of the box; only qualm is that the game crashes after the credits have rolled (both for regular ending and Another Day).
Steam Overlay had to be enabled otherwise PS4 controller had buttons inverted (O swapped with X, L1 with L2, etc).
Crashed when viewing the ending credits and could not progress due to auto-saves; had to transfer to Windows VM to fully play out, autosave, and then resume on Linux.
Works perfectly OOtB.
The game will crash after the end credits, only option at the moment is to transfer the save file to windows let the post credit scene play and switch back.
Runs perfectly out of the box.
If using Alt+Tab exit full screen mode, the game may crash.
Had been played 30 mintures, just had some issues when tried to exit full screen mode by ALT+Tab, but it is completed playable and do not had other problem.
Fast loading times, low power drain, pretty much an optimal Deck experience out of the box here.
Opened with Steam Tinker Launch
Ingame. Changed button icons in Options menu to Xbox buttons. B is Confirm in menus by default, can be changed from ingame controls menu.
Some button icons are quite small, but still readable
Very slight audio hitches, likely due to playing from SD card. Noticeable when opening options menu for the first time and tabbing through. Added pulseaudio latency of 60ms from Steam Tinker Launch which seems to mitigate it.
Game can run at 60fps comfortably with a reduced wattage. 7 watts will experience very few frame drops, but 6 is fine as well.
The game will crash when attempting to view the end credits. This happens during the game's post-game scenario, "Another Day".