Been messing around with my SteamDeck where
Killer is Dead says it doesn't work, loaded it up as I've seen other games such as Sleeping Dogs play fine even though they're not meant to. I did the first episode then the game crashes on the second, from what I can see under the discussion page, it only does it on Episode 2 that I hope Valve do get to testing the game & does some sort of fix. Did look some people had come up with some very PC looking fixes about moving files around etc
Bright Memory Infinite an odd one to load up as I played on Switch this year and I basically wanted to compare a game on these two hybrid portable systems and docking this with the Deck looks so much better than it did on Switch as I'm getting high settings compared to Switches lower than low. I was at 960p though even docked to get 60fps and High.
The Missing: J.J. Macfield and the Island of Memories another random one but as it's a tad older and 2D, wanted to see how this would be docked, well it's 4K the highest graphic setting of Fantastic at 60+ fps (I capped the deck at 60fps as why do I need 63fps) and the hour or so I played was good little 2D Action Adventure Puzzler thing, and I will go back to it mostly liking playing in handheld.
Ghostwire Tokyo a big one to chuck at the Deck being only on PS5 (Next year Series) and the Deck being compared to a portable PS4, well on the go where I have spent most of my time sure it's like 720p with medium settings at 40fps it looks and plays well with the screen being the size that it is. Did play a little bit docked and is playable but certainly not ideal way to do so.
I've got few games downloaded like Metal Gear Rising as I've never played it and this might be one of the best ways to play it outside a proper PC, GRID Legends as why not try a racing game. I can see me also playing likes of Cult of the Lamb, Monkey Island, Tunic on Deck over the Switch as looking at Bright Memory, The Missing this has sort become the Switch Pro to me.
Still will play a Gotham Knights on Xbox, Valkyrie Elysium on PS4 and Crisis Core on Switch due to the cost of the digital downloads and being able to get those physical.