(Unique game aspects not part of story canon)
Ghouls 'n Homunculi is a minigame for Resident Evil: Revelations 2 that is unique to its Nintendo Switch port. The game is an adaptation of Ghosts 'n Goblins with the graphics based on Ghouls 'n Ghosts, featuring Barry Burton in place of Arthur the Knight.
There is only one level in it that loops once completed, the level is a copy of the first level in the original Ghosts 'n Goblins for the NES, the items Barry can pick up will be turned into Gold and BP, both of which are currecy used in Raid Mode. Much like the original games, if Barry takes a hit his clothes get removed, another hit during this state will kill Barry and he will have to start from the beginning.
The music played throughout the level is an 8-bit remix of Lost, the soundtrack played in the main menu in Revelations 2.
There are three enemy types in this minigame, zombies, Glasps and a Vulcan Blubber which is the boss of the level. The Glasps and Vulcan Blubber both behave based on how they work in the main story, the Glasps disappear after a short amount of time and the Vulcan Blubber shoots out fireballs.
The weapons Barry can use are also based on weapons used in the main campaign, there is a knife which is used as a projectile (just like the Dagger in Ghosts 'n Goblins), a pistol that pierces through enemies and a Firebomb Bottle that works exactly as the Torch in Ghosts 'n Goblins.