Thanks! Unfortunately, although they allow custom chart videos, the devs requested not to allow file downloads for custom charts so I can't share the rift or crypt charts.
It totally should be game music - but it's actually a remix of new world symphony which is classical. It's a bit of a weird sorting method until I chart the other songs from this game, but since most others feel more classical I wanted to generalise the game into the folder.
It feels very solid - I've got the hit feedback noise on enemies disabled, but you use arrow keys left/up or down/right to whack them. Once you figure out how to play the patterns, they're super smooth and responsive. Enemies telegraph their moves based on what type they are, like the bats moving in the direction they're facing after I hit them.
i think about how this opening spoiled all the anime-only watchers (me and my mom included) that robin was gonna join the crew and i find that hella funny