A few years back when Jorenko and I still had the dream of making video games, we came up with the concept of making a music-based platformer that, if you did everything exactly right in the run through, you got a great song by the end of it.
Of course, we gave up on that as we are procrastinators of the highest caliber.
Thankfully, GaijinGames are not procrastinators. I finally got around to buying BIT.TRIP RUNNER yesterday. It is AMAZING.