First of all, Toby Fox clearly gave permission on his Twitter account that we can use his music like this.

Secondly, YouTube doesn't even credit toby as the owner, so they can copyright claim themselves.

Thirdly, I spent so long on this video (it's all notable versions of megalovania btw) so it's especially annoying.

So I dunno if anyone can help me but it'd be appreciated if you could.

I recieved the claim for the undertale megalovania and the smash bros version

Finally, fuck you YouTube