As can be explored, all the (English) books out there show basic (or little of intermediate) aspect of the framework, plus already a pretty decent enough PG done by @slackmoehrle. So, plz describe more important aspects of the framework!
And also, the live stream game doesn't sound advanced to me just bcoz it has physics in it.
IMO, it's good to pick something fun which can't be found anywhere else and also is easy/interesting enough to implement if someone wants, which I think
Physics would do