Fun dungeon escape full of Greek mythology! Casting Felix the Cat as a Rakshasa is the best. Backwards name and backwards hands!
I ran into questions in a few places; for instance, regarding Quakes with Xelif. Since that happens every round, is there always a 50% chance of hitting another PC? Or is it one time per round? Can the Cyclops's key simply be taken while he's petrified? Is this intended to telegraph the Medusa?
Regarding the Medusa, I love the idea of calming the pool, a great way to incorporate the environment; similarly, the Cerberus' Lair bursts of fire. And "Tracks. Circuits the room — Match the PC's footwear." Great way to provide players with insight into some of the setup here!
Great work! I love a bit of mythology! Oh, and great maps as well!