Currently tuxDB.com found games that are Steam Deck categorized

Verified: 4731

Playable: 9740

Not working: 3914

All functionality is accessible when using the default controller configuration
This game's default graphics configuration performs well on Steam Deck
In-game interface text is legible 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

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