I just got a Steam Deck and will be using it as a console with my wife & kids - in that light I’ve bought a lot of smaller co-op and local multiplayer games:

Stick Fight: The Game Stikbold! A Dodgeball Adventure Moving Out Broforce Cook, Serve, Delicious Portal 2 Rubber Bandits HOT WHEELS UNLEASHED Horizon Chase Turbo Ultimate Chicken Horse Human Fall Flat CarX Drift Racing Online Nidhogg Sonic and All-Stars Racing Transformed Collection

We’ll see what else we’ll go for, but that should help us get started :)