I agree with you on preferring a jam game to be too easy than too hard. I have this compunction to play everyone's game and play it through from start to finish, so getting stuck in one spot on one game is really frustrating.
Leaving the storyline for last is fair. I like the idea with the second magical girl, it's too bad that didn't make it in. It's interesting to hear about what you wanted to put in the game and weren't able to in general.