There's gonna be a demo? :) :P
I know that i'm late and i'm sorry about it, i suggest you to try Nosferatu The Wrath Of Malachi, it's similar to Dungeon Nightmares and it's very re-playable :P
I've played Nosferatu, its pretty good and has a lot of nastalgia with older games.
Unfortunately its not quite as good as Dungeon Nightmares I & II. Each dungeon is different every time you play and there are so many jump-scares in random places, you will always get a good "jump". The developer designed every dungeon to be procedural-generated which makes it new every time you play.