What are some alternatives?
When comparing Audiosurf and Osu, you can also consider the following products
Rocksmith - Rocksmith builds off of the fundamentals of music games like Rock Band and Guitar Hero by offering fundamental lessons in actually playing guitar.
StepMania - Rhythm game for Windows, Mac, and Linux.
Frets on Fire - Bonus content.
Clone Hero - Clone Hero is a free rhythm game, which can be played with any 5 or 6 button guitar controller...
Rez Infinite - The ultimate version of Sega's psychodelic rail-shooter adventure Rez, fully remastered and evolved, including VR support and additional new content, all by members of the original development team.
VOEZ - VOEZ invites you to embark on the remarkable journey of teenage dreams