Hey, thank you so much for your interest!
It's not in Ren'Py, but rather VN maker.
There are some choices, and some different scenes will occur, but it will not affect the main story.
Visual Novel Maker... *sigh* I really like your concept and I might have even supported it, but I tried and I can't even get the demo to run, which isn't a surprise since VN Maker is basically strictly Windows only )-:
Yeah. They have options for other stuff, but in my experience it never works.
If it makes any difference I'm going to upload a full playthrough on my youtube channel of the demo soon after I fix some minor punctuation.