I noticed the bug with the pause menu last night and fixed it straight away, so it will be fine on the next version. Thank you for the heads up though! :)
I'm sorry to hear you find the campaign levels boring. I'll be focusing mainly on them now for a short while. I do want to make more of the other tracks as well, but there are some core features that will need more work first. But don't worry, I think the core of the game is almost done, and after that I can hammer out levels a lot faster!