If you prefer Steam as your main store the Steam Scream: The Revenge event is live now until November 2nd, featuring discounts and demos for some spooky times. Valve also updated the Points Shop to have a new Halloween collection you might want to pick up a few bits from.
Here's some quick-pick juicy discounts on spooky games in the event. All of which are Steam Deck Verified to make it easier for you and I'll include the ProtonDB rating and noting if any have Native Linux builds:
7 Days to Die (76% off) - Native Linux
Control Ultimate Edition (75% off) - ProtonDB Platinum
Salt and Sanctuary (75% off) - Native Linux
Alien: Isolation (66% off) - Native Linux
Dead by Daylight (60% off) - ProtonDB Silver
Resident Evil Village (60% off) - ProtonDB Gold
Cult of the Lamb (60% off) - ProtonDB Platinum
DEATH STRANDING DIRECTOR'S CUT (50% off) - ProtonDB Gold
Halls of Torment (20% off) - Native Linux
See the event page here.
What have you picked up? Give some suggestions on some goodies in the comments.