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Also what do you mean by "glorified markup language".

Well technically, renpy games are written in python.  renpy uses the ".rpy" extensions and python uses the ".py" extension. Renpy was made from pygame (from what I understand), and pygame is a python game engine. This makes renpy a python game engine. True , there are some differences, but the back bone of renpy is just the backbone of python. 

The systems of the game are made in pure python. Except some screens that renpy gives to me