It’s been mostly Isaac as usual but I picked up Shotgun King: The Final Checkmate yesterday and I like it a lot. It’s a fast-playing roguelite with a neat idea that’s implemented well. The game mechanics remind me of Hoplite on mobile.

The game is currently on sale and has a free demo. It has good controller input and low resource use, a great fit for the Deck.

I picked this up about 2 months ago. Took me about 100 hours before I could put it down.

Backpack Battles. It’s an inventory management based auto-battler. Chill game and I like spatial puzzle a lot.
The game uses the Godot engine and it runs great on the deck. The UI is very smooth and thoughtfully designed.
A neat thing about the battle system is that it’s fully asynchronous. No matchmaking delay and it even works offline. I believe it works by preloading a number of opponent-builds at the beginning of the run.