What are some alternatives?
When comparing Audiosurf and Rocksmith, you can also consider the following products
Frets on Fire - Bonus content.
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.
Clone Hero - Clone Hero is a free rhythm game, which can be played with any 5 or 6 button guitar controller...
StepMania - Rhythm game for Windows, Mac, and Linux.
Incredibox - Express your musicality, pump it up and chill
Osu - Osu is Music, Rhythm, Single and Multiplayer video game developed by Dean Herbert.