PLATFORM ADVENTURE
Dr. Chaos (NES/FDS, 1987)
Subgenre: Proto-Survival Horror, Action Adventure/P&C Adventure Hybrid
Perspective: FP view Adventure segments/Side view corridor and action level segments
Other: Hub and spokes structure (4 floor mansion connected to other dimensions - these play more like straightforward platformer levels)
Non-linear structure
Minor ability/tool gating (breathe underwater with the air helmet)
Enemies found while exploring in FP view can chase you into the corridor (you then have to fight them to proceed as you can't enter other rooms during the chase)
Energy tank item (red vitamin)
Enemies don't drop anything
Password save
No map
Some sequence breaking possibilities via damage boosting: https://www.youtube.com/watch?v=WsgJq5kvuJI&t=1h20m54s
Influenced by: Goonies II, possibly Castlevania or Vampire Killer (MSX), Uninvited, Ghosts 'n Goblins
Influenced: Possibly Friday the 13th (NES)