Currently tuxDB.com found games that are Steam Deck categorized

Verified: 4706

Playable: 9705

Not working: 3903

All functionality is accessible when using the default controller configuration
This game sometimes shows mouse, keyboard, or non-Steam-Deck controller icons
◾ This game requires manual configuration of graphics settings to perform well on Steam Deck
Some in-game text is small and may be difficult to read
Notes:
◾ This game does not support attached controllers for the primary player

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