Merry X-ma...wait a minute! It's not Xmas time, but still super cool! :)
I love my Steam Deck as well^^
Enjoy

Hi! I don't have a Steam Deck but I played Yoku's Island Express with controller and I think it will play well on Steam Deck.It's a puzzle platformer where you roll a ball to move and in some parts play as pinball.

you should test one more gate !

I recommend to you, Idle slayer!!!!

I recommend Project Zomboid.
It is one of the best zombie survival games out there, and you can play alone or with your friends, and it also has a great modding community.
I tried it a bit on steam deck and it has controller support

I would like to recommend one of my favorite indie games of all time, which is Yuppie Psycho. I noticed you had some playtime on it but no achievements so I figure maybe you only afk'ed it for cards. Before I played it I kept dismissing pixel art games because I didn't think they could possibly be so good with such simple graphics (what a mistake that was) as Yuppie Psycho is easily one of the best indie games I've ever played, and since then I've played many many more pixel art games and I love them so much now. So yeah, that game has a special spot in my heart.
If you do play it I'd recommend saving on many separate save files, as it makes reaching the alternate endings easier and some of those endings are incredible.
It's a game I don't want to say too much about story-wise as it's an experience to go through without knowing anything, sorry in advance if you have played/tried it and didn't like it.

I am not sure if all of them run on the Steam Deck. So, these can be considered more as general games recommandation.

First one is Future Proof. Very cheap and not too long. The game combines exploration, acquisition of hints and items with some interesting puzzle solving. Game is mostly on the silly side with several endings which all - more or less - cover your survival as an asteroid is destroying your town. It has charming graphics and I had a lot of fun figuring stuff out.

Second one is Crystal Caves HD, a classic platformer. You have to comple singular levels while collecting treasures and avoiding death. Also, has a large workshop with over 1000 maps. Some of them are even good :P

Last one is Wizordum which is still in Early Access but nonetheless a very good play. A boomer shooter with a colourful fantasy setting. For some it might be to easy or even boring. I enjoyed it a lot anyway and it still keeps getting updates, with an active developer.

My favourite chilldhod game is by far Super Mario World.

deep rock galactic survivor is pretty fun if you like survivor-like games. and it runs well on the deck

Hi, If you like turned-based strategies I reccomend Songs of Conquest, which i'm currently playing. Its steam deck verified so it should run well :)