Currently tuxDB.com found games that are Steam Deck categorized

Verified: 4732

Playable: 9750

Not working: 3918

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
Notes:
◾ This game does not support attached controllers for the primary player
◾ This game's first-time setup requires an active Internet connection

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