I know there's plenty of people here who have played Undertale fangames. Does anyone know what the song in this video is called? I'm certain it's from one of them because it sounds like fan Megalovania but there's like hundreds of those that I don't have

I know there's plenty of people here who have played Undertale fangames. Does anyone know what the song in this video is called? I'm certain it's from one of them because it sounds like fan Megalovania but there's like hundreds of those that I don't have