Yea the combat and scouting rules are not really stated in the current version of the game, I just have it listed as a hint on the game page. A quick tutorial screen was the last thing on my list of emergency fixes for the last day, but adding a game over screen took priority.
Maybe it's a good thing in your case, since the NTR stuff doesn't start happening until the third quest. To anyone else looking to avoid seeing something they don't want to see, I recommend playing through just the first two levels. They give a pretty good idea of what the game is like without getting into the more kinky content.
Fio's design is probably my favorite too. I'm very proud of how my cast turned out for this game. Some of the facial expression need some rework, but I'm super glad that I went with the style that I chose. In the "post your work" thread I attached a picture showing the early evolution of Espa's design, or at least a character that would get replaced by her. Fio's design on the other hand barely changed at all, I think my vision for her character was a lot more on-point from the start.