The Nintendo Switch Lite can run just about every game the Nintendo Switch can, but with caveats. Here is every game we know of without a handheld mode.

Keep in mind these games will still be playable in Tabletop mode - but this will require an external stand and separate Joy-Con. See How to Play the Nintendo Switch Lite in Tabletop Mode for more information.

Super Mario Party

1-2 Switch

Just Dance (all)

Fitness Boxing

Labo VR

Super Mario Party's mini-games require detached Joy-Con to take advantage of motion-controls and HD rumble. 1-2 Switch shares the same problem.

Just Dance and Fitness Boxing are both games that track hand movements though the Joy-Con's motion controls. You can't do that with the Switch in handheld mode, as many of the movements require individual motions from each arm.

Labo VR is primarily a cardboard apparatus that holds the original Nintendo Switch in place as a screen, with the detached Joy-Con used to play. Not only are the designs not built to hold the differently-shaped Nintendo Switch Lite, but its smaller screen and undetachable Joy-Cons cannot be detached.

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As described, most games that rely on physical motions to play the game will not work with the Nintendo Switch Lite as is without using it in Tabletop mode with separate Joy-Con.