Compared to Audiosurf or Beat Hazard, Symphony feels the least like you're actually playing your music. The music comes off as secondary to the gameplay itself, when it really shouldn't.

IT HAS BOSS FIGHTS!!!

really really cool game i like playing touhou music in it

A super fun take on generative music-based gaming that I didn't expect to be that engaging.

When it comes to games that base the gameplay on whatever music you feed them, this is one of the best. Also possibly the only one with a story mode.

https://www.youtube.com/playlist?list=PLqMjCvPXndWd-Lx19ezYppPglbVyG84pg