Games like Undertale: Hard Mode - Wonderful Idea [Genocide Ending]

If you finished Undertale: Hard Mode - Wonderful Idea [Genocide Ending], the closest matches are Undertale Green: The Pre-Show, UnderTale: DoctorTale, Undertinge, Undertale: Call of the Void and Undertale: Thanatos!. All 7 share its game genre and are ranked by how closely their themes and modes overlap.