Author here - just wanted to say thanks for the feedback and kind words. I know there's a couple of rough UI edges in there yet, but I figured it was about time I just shipped something :-).
I'll take note of all the suggestions and try to fix anything that needs changing over the weekend.
It looks pretty good and I'm going to be going through at least some of the exercises. It always feels good to ship something, even when you feel like it isn't 100%.
> It always feels good to ship something, even when you feel like it isn't 100%.
Sort of, although at first I found showing it to the world a touch nerve-wracking :-). Realistically though, if I waited until I judged things were 100% ready I would never put anything out there.
I'll take note of all the suggestions and try to fix anything that needs changing over the weekend.