Quick answer
No public Valve Deck category was present in the metadata reviewed for this snapshot. SteamDB’s configuration exposes a Windows executable, while the store lists Windows requirements. That is insufficient evidence for a Verified, Playable, Unsupported, or performance claim.
What “no rating” means
An absent compatibility result usually means the public record has not classified the game. It does not prove Proton cannot start it, and a successful user launch does not establish full-game compatibility. Puzzles, controller prompts, text size, video playback, saves, and later chapters all matter.
Safe community testing order
If you already own the game and choose to test it:
- keep SteamOS and the game updated;
- try the default Proton selection before forcing an older runtime;
- test controller access, text readability, manual reload inputs, saving, and a representative gameplay section;
- record build and Proton versions when reporting results;
- retain a desktop save path if the current save behavior is uncertain.
This is a troubleshooting framework, not a hands-on compatibility verdict. Recheck Valve’s store badge and SteamDB metadata after future patches.