This one? Not quite as cool as Barrier Seed, but eh. That being said, since I've only heard Patchwork from Nameless, it's weird to hear this kind of vocals from them.
Osu! is a rhythm game based off of Osu! Tatakae! Ouendan! and the American release Elite Beat Agents. In these games you click circles to the rhythm of the song. Osu! also has different rankings you can shoot for, with SS being the best (Hit every note and have 100% accuracy). There are also mods like Hard Rock, Hidden, Flashlight, and Double Time/Nightcore if you want to increase the difficulty even more.
At this time, JonathanScarlet has 3,971 views for osu! spread across 785 videos. His channel published over 1 day worth of content for the game, or 20.02% of the total watchable video for osu! on JonathanScarlet's YouTube channel.