Did you enjoy the previous Runner games or the BIT.TRIP games? Runner3 [Official Site] could come to Linux if the developer sees enough demand. Due for release for Windows and Mac on May 22nd, it is a shame that it's not currently coming as it looks damn fun. The previous game was on Linux, so it's quite sad they didn't get Linux support in right away for this one too.
Here's what a developer said on their Steam forum:
No plans for a Linux version at this point but if there proves to be enough demand for it we're happy to reconsider!
If you would actually buy it, do let them know in the linked forum post.
Don't know if you're interested? Take a look at the trailer to help you decide:
Thanks for the tip, Mahen!