http://www.pcgamer.com/the-devils-eight-is-a-musical-boss-rush-based-on-super-smash-bros/

The Devil’s Eight is a neon-lit, music-driven boss rush that’s set in the circles of Hell and features 2D combat inspired by Super Smash Bros. It went to Kickstarter last week, seeking $32,000 in funding to bring developer Second Step Studios' vision to life.

“The music inspires the visuals and design choices for each boss and circle of Hell,” the Kickstarter reads. “The AI for the Overseers is powered by the beat, meaning boss actions sync up with the music.”