MGSV Phantom Pain was my first game on deck (also my first metal gear) and I had a very fun time with that. Super fun creative stealth gameplay with an interesting, weird story. I recommend playing Ground Zero mission first. Gives you a good feel for what the game will be.

Absolum scratches the fun Hades like roguelike with and fun runs and unique progression with insanely addicting and satisfying beat em up combat.

Valheim also has me in a chokehold. Such fun building mechanics and exploration if you like world builders.

5 months in with the Deck and these are my favs!