Currently tuxDB.com found games that are Steam Deck categorized

Verified: 4704

Playable: 9704

Not working: 3904

All functionality is accessible when using the default controller configuration
This game's default graphics configuration performs well on Steam Deck
This game sometimes shows mouse, keyboard, or non-Steam-Deck controller icons
Entering some text requires manually invoking the on-screen keyboard
Some in-game text is small and may be difficult to read

Check Steam Deck categorized games based on your Steam Name/SteamID