Doctor Faustus (and Faust interpretations in general) are one of those forever prescient kind of stories that toe the line of moral ambiguity and consequences. It's really cool to see it being presented in a visual novel form, especially in the original writing. The text scroll speed didn't seem to do anything for me. I tried adjusting it and didn't notice a major difference. It would be cool to see some more dynamic scenes here and there (the equivalent of CGs in a visual novel, I guess) just to break up things a little more here and there.
This should be an interesting little piece when it's all said and done.