Single Player Campaign
Ok, so you have all of the assets (maps, characters, et cetera).
Why not build a single player campaign for steam deck using them?
Rather than repetitive gen work on each map, make each one unique, with dead corpses holding clues on where to find things, make it about distracting the killer and saving a survivor that tells you the location of a map that leads you to a broken or skeleton key, or on other maps, parts to a generator that are installed, and then some creative ones related to the film franchise in question or modding broken keys with parts that reveal and unlock special hatches, or for the final level, items that can be used to fight back to vanquish the killers while a NPC you work with has a spell book to send The Entity away. Create a lore with info throughout the maps that can be found to tell the story of The Entity, how it controls the world without most people realizing it, and how it uses horror movies to create fear that it feeds off of, and the horror movies are actually alternate realities filled with people taken from the real world (like the horror movie Scent or Waxwork). Each level contains multiple cut scenes that tell this story as well.
Add in DLC maps for the following franchises for multiplayer. Expand the maps and add in new modes inspired by the single player campaign. Take elements from Friday the 13th game but improve on them. Make drivable vehicles that can be used to travel fast across maps and run over and stun the killer, and weapons that can be found that individually stun like the flashlight or be combined for greater stun times.
1) Killer Klowns from Outer Space (map)
2) Aliens (map, characters and killer) - Perks, leaves face hugger eggs that hatch and attack survivors, survivors have to find a medical bay to extract alien, otherwise kills survivor and hatches an additional bot alien. Map is from the movie, either the ship or the colony. Characters Ripley, Hicks and other marines/androids.
3) Predator (map, characters and killer) - perks include firing a laser, and ability to cloak.
4) Nosferatu (map, killer) - Perks include turning into a bat that can move faster but not hit, ability to transfix survivor when caught off guard for a 15 second extreme skill check challenge where he bites the neck and survivor has to complete skill checks like the spare part tool box add-on otherwise becomes instantly hooked in a coffin like Silent Hill and then has to find a garlic spray or injection like Resident Evil to prevent turning into a vampire or dying after a set amount of time once released.
5) The Mummy (map, killer) - map is a museum, maybe like the movie Relic with Egyptian exhibit and pre-historic cave man, Neanderthal and Atlantis side story exhibits (like the movie 10,000 B.C.). Killer is silent, no heartbeat, like Michael Myers. Slow and silent but can transform into The Sphinx, a cat-like monster that moves fast but has a warning.
6) Frankenstein (map, killer) - map set in castle Frankenstein, filled with NPCs with torches and pitchforks. Frankenstein's perks include electric discharge like a Sith Lord that can turn into a hit and ability to make survivors think he is near via the heartbeat when he is not.
7) Werewolf (map, killer) - map set in Nazi Germany during WW2, in a concentration camp and forest outside it. Lore of the story is Nazi experiment gone wrong. Perks include full moon that runs for 20 seconds that turns anyone hit into a werewolf that automatically attacks other survivors after a 5 second warning, and ability to transform into a survivor and sneak up on others without warning (but a 3-5 second transformation period).
For the above four, maybe add in characters from The Monster Squad movie.
Also, 8) Phantasm (killer, map)
9) Night of the Living Dead, Dawn of the Dead and Day of the Dead (maps to be used with Resident Evil).
In addition, get rid of the blood web or make it optional, have a store where you can buy items with points earned (with skill increases tied to the amount of points earned rather than blood web completions). If not that, allow an auto-complete option for the blood web.
Allow a character perk from the Predator DLC to be cloaking for 10 seconds for survivors (they leave tracks and can be heard but can't be directly seen except when sprinting as a cloaked field like in The Predator movies).