Thank you for playing the demo, and it literally made my week to hear you enjoyed it!! I'm also glad the story did its job of presenting the project's two timelines and making you wonder that exact thing....which the main game will reveal of course!
For the text in RenPy, go to your game's options.rpy file and look for this line:
default preferences.text_cps = 20
This is Characters Per Second or "CPS" - tells the game how many characters are typed out per second. Changing the above line sets the default that the game will use. If you want to change it for just one playthrough, visit "Text Speed" in preferences!