I think starting with 3 heroines for his first game, was a "mistake" on his part. He underestimated the amount of work involved in creating a game versus just creating the story in a doujin format. 3 heroines with 3 antagonists, and we already saw that the pairings can be mixed among the 3.
Though, I don't think the amount of h scenes was the burden on his part, but rather just putting the "events that lead up to those scenes" in the game.
I am curious what his reaction will be once he finished this game. Will he still have interest in creating a new one?