From the blog of Big Robot, the developer of Sir, You Are Being Hunted:

In Permutation Racer you race against the clock to reach checkpoints, collecting stars (you can jump, don’t forget) and avoiding barriers or red spikes. Because it’s all mathematically generated, every track is different. This is just a prototype, so it’s very simple, but we think you’ll enjoy it.

Permutation Racer was created by Tom Betts. It’s a free download for Windows and Mac OS X. I’m enjoying it a lot (and the soundtrack is great). I hope you will too.