Considering the run of recent releases and bad performance on Steam Deck, it's refreshing to finally see a game running great on release day.
Not only is Atomic Heart a great mix of combat with Dying Light 2-style melee, CP2077-style dialog and quips, and Bioshock-type abilities, but it can hold a fairly consistent 60 FPS on Steam Deck without the need for FSR, although it does only have FSR 1 at present, which doesn't help the quality at all.