Aside from now being able to figure out why the spinning was needed (in other words, the theme didn't feel well-integrated), the overall feel and gameplay was pretty solid. Very difficult game as well. I enjoyed this.
I appreciate the feedback, unfortunately, I realised after submitting that I hadn't made it clear how to navigate to the second how-to screen, which goes into a bit of detail regarding what is affected by your rotation speed. Thanks for having a go!