I have just checked out this game, it's good but it misses a little bit to be perfect, the girls are to willing, it had been better if the where a little bit more shy (not rape)
My advice is to chose your editor wisely, as stated above, you kan use any txt editor, but I have chosen notepad++ because it has the ability to format your .rpy files in a way that makes it a lot easier to not loose oversight of what your are doing.