I just finished building a phone-based adventure game. The number is (888) 877-7418 (which is a toll free number). The code is here: http://github.com/jjinux/teladventure. Give it a shot!
I used Ruby on Rails, behavioral-driven development (with Cucumber), and Twilio. However, these same tricks work in Python too since Twilio is language agnostic.
Check out my previous post about using behavior-driven development to build phone trees.