This title isn't a PC game, so the practical question is which souls-like to play on a handheld instead. Here's the honest picture with real fps and ZAR figures.
Quick Answer
Demon's Souls Remake is a PS5 exclusive and never released on PC, so it cannot run on the Steam Deck. For a comparable handheld souls experience, Dark Souls 3 holds a locked 30 fps and Elden Ring runs 30-40 fps on these devices. The Steam Deck costs roughly ~R8,000-R13,000 (LCD to OLED) at Evetech; confirm current pricing before you buy.
Why Demon's Souls Remake won't run here
Demon's Souls Remake is exclusive to PS5 and has no PC release, so there's nothing to install on a Steam Deck or ROG Ally. Don't trust listings claiming otherwise. Instead, point the budget at a souls-like that genuinely runs on handhelds.
The closest handheld souls experience
Dark Souls 3 runs a near-locked 30 fps at 800p on the Steam Deck OLED with medium settings. Elden Ring manages 30-40 fps with FSR. Both deliver the deliberate, punishing combat that Demon's Souls fans want, and both are fully Steam Deck Verified.
SA buying notes
Handhelds are stocked locally with local warranty, so you avoid import hassles. A 512 GB microSD card holds several large souls-likes; budget around R600-R900 for one.
FAQ
Can I play Demon's Souls Remake on a Steam Deck or ROG Ally?
No. Demon's Souls Remake is a PS5 exclusive with no PC version, so it cannot be installed on any PC handheld. The closest options are Dark Souls 3 and Elden Ring.
What souls-like runs best on a handheld?
Dark Souls 3 is the smoothest, holding a locked 30 fps at 800p on the Steam Deck OLED. Elden Ring runs 30-40 fps with FSR and is the most ambitious open-world option.
How much storage do souls-likes need?
Elden Ring needs about 60 GB and Dark Souls 3 about 25 GB. A 512 GB microSD card (around R600-R900) comfortably holds several of them alongside your other titles.
's Souls Remake on handheld and install Dark Souls 3 or Elden Ring instead; add a 512 GB microSD card so you have room for both.