An artist covers famous titles, but not using the word cover or remix.

[greattug]

Samuel Kim is talented and his music is very good and looks professional for sure.
But he did not mention his Attack on Titan or many other works are Remix-Covers.

Epic Cover, Remix might be the right word for it.

He played with the words and wrote as Collection. 

Is it a Collection or a Cover?  

Otherwise, they are using graphic logos and fonts of the original title, like it's from the publisher. 

It's not professional. I very much respect his art and it tastes very original. But misleading, showing the artist as he worked in the title.

It creates misleading fame for the artist, It seems he just makes it profit without the right.

And other artists also must be credited with other titles with reminding by visual and name a cover. And don't conceal the truth, from any professionals or listeners.