Congrats, if somebody is able to study the stuff in a few hours. I am not.
Our approach is just different. We did not try to understand every API command. We just made a 2d-physics game and started to work on a 2.5d adventure prototype. So we dont need to know every option of the engine at this moment.
Our work is always more goal-driven. We dont have unlimited time and try to do as much as we can with the given resources we can spend. This is just an economical approach.