Thanks. No, I haven't played Sword Quest. The comments on the blog point out how it resembles Dragon Quest and Ultima IV for the NES, while Mark Hughes' page for the original Python 2.1 Umbra (https://mdhughes.tech/software/umbra/) says it's influenced by dungeon crawlers and console RPGs. I think that's the clearest visual connection. If Sword Quest uses drawing primitives to create its enemy graphics in vector, that's another.