I love horror games and I love dungeon crawlers. If I ever made a videogame, which is becoming less and less likely, it would be a procedurally generated mansio

I love horror games and I love dungeon crawlers. If I ever made a videogame, which is becoming less and less likely, it would be a procedurally generated mansion that was something like Betrayal at House on the Hill meets Slay the Spire. You'd have some main antagonist haunting the mansion that you want to defeat, accessible in one of the rooms you need to discover. All throughout the mansion are artifacts that can make you stronger at defeating the boss, but picking up these artifacts usually triggers some haunting mechanic that makes general traversal through the mansion more difficult. One might turn the inanimate statues scattered throughout the mansion into active enemies. One might trigger a slenderman-type stalker mechanic. One might cause the mansion to start collapsing on itself, so each room starts losing floor tiles in ways that make some of them no longer traversible. One might rerandomize the layout of the mansion. It becomes a balance of collecting enough powerful items to be able to defeat the boss, but not so many that the environment becomes too hostile to reach the boss at all, causing you to succumb to the mansion. Then add a few other mechanics like events that autotrigger when you enter a room so it becomes not in your best interest to explore the entire mansion before you start collecting items.