This is A megalovania theme for undertale AU RipkaDUST which is a branch of RipkaTale, as short description says.

Made using bandlab, and bandlab sound kits.

You can use it for stuff that does not include directly publishing the song, (remixes are ok, publishing this on some site for music is not.), but if you use it outside of newgrounds game/animation/something portals, for history purposes, link back here (this long description is necessery even tho nobody will actually use this somewhere)