I really enjoyed Dave the Diver on my deck, I'm only 9h in but didn't play for a while due to lack of time.
Another one that isn't really my thing but uses practically no battery is Minecraft through PrismLauncher (I don't like playing Minecraft on controller).
And some other games from my library that play nicely on deck, some might take a little bit more power:
Celeste
Geometry Dash (especially with the new platformer levels)
Hue (might be a bit boring, I got it for free)
Pole (might be a bit frustrating, I got it for free)
Rayman Legends (there's a certain patch to make it run without uplay)
Same here. My only issue is sometimes I mix up some card suits due to the lower resolution and smaller screen size, and because I'm not paying close enough attention, end up playing a high card hand instead a flush.
I'm currently traveling and really enjoying Against the Storm on the deck. Its easy to pop in for twenty minutes or just sink a couple hours into it. Runs super smooth on the deck.
It's technically "unsupported" for steam deck for some reason but one of my absolute favorites.
Heat Signature
It's a top down shooter roguelike with tight controls and and tons of replayability and it's extremely battery friendly, i remember being trapped in the woods for a few days and I was able to get 8 or so hours of play from that game
Yo thank you for the suggestion, this game looks hilariously amazing. For anyone else, its also in space and looks like a darn blast if you love space themes. Only 15$
Not at all, its totally built for controllers, I'm really not sure why it's unsupported, i even started an entirely new save and played through the game again and had not a single issue, not one
Can confirm that into the breach is similarly lowpower. It's absolutely great for deck. It isn't time-based like FTL is, which makes it even better suited. (FTL makes me miss a mouse sometimes)
you can easily get 8 hours emulating ps2 games at 4w tdp and 1080p resolution, been playing persona 3 fes mostly because of that.
I've also been able to push 4 hours emulating the switch version persona 5 royal at 7w tdp and 900mhz
though I'm not sure what extended travel means, I "only" travel 3 hours to class over one day
How did you ever get the controls mapped correctly? I LOVE Outrun 2, but my ZR /ZL were mapped to a single Z axis, meaning I can't break and use the gas at the same time, making drifting almost impossible :(
In a weird way it is the really really fast paced games I like the most when on the go.
If I play 5 mins of Voidigo, DIG or Enter The Gungeon, I can potentially experience a lotttt of gameplay .
Playing Xonotic against bots is a blast, Xonotic probably uses less battery than any other 3D game in existence lol. Similarly 5 mins of Xonotic is a LONG time.
Motor Town is a great driving game to play while traveling, so is Snowrunners.