Whereas Undertale is "The friendly RPG where nobody has to die", Horrervale is "The spooky RPG, were everyone is already dead". Sans makes a cameo, kind of.
Undertale is directly cited as an inspiration on the page for the rebuild.
Undertale is directly cited as an inspiration.
Toby Fox promoted this game on twitter.
Undertale is directly cited as an inspiration. You can spear Enemies.
Undertale is in the tags, and directly cited as an inspiration.
Undertale is directly cited as an inspiration.
A quote from a beta tester says "it's got pretty heavy Undertale vibes". Since the devs quoted this, they must be proud of that.
IDK, man. Undertale is in the tags.