Playing with creative AU concept these days, some of them will get develop.

[Terraria] - Devourer

Dusttale AU challenge, but the main concept is phantom Papyrus.

[Terraria] - Corrupted Goldfish

[Slay The Spire] - Sentry

[Slay The Spire 2] - Phrog Parasite

[X-Tale] - Muffet

[Terraria] - Eater of Souls

Dusttale AU challenge, but SP! Dusttale

[Terraria] - Eater of Worlds