Rush Bros, a side scrolling platformer featuring music reactive level design is available today on PC and Mac. It’s currently available for discounted price of $8.99 as well as in a special 2-pack bundle at $14.99.
Featuring tracks from artists like Infected Mushroom, the level design (traps, obstacles, and background) changes based on the music playing. The objective is to finish first place while thwarting your fellow competitors. Online multiplayer features cross-platform play between PC and Mac gamers as well. You can also jam out to your own music by importing songs from your personal MP3 or OGG music library.
Find it on the Steam store here: http://store.steampowered.com/app/234490/