I really wanted to make a game where it was encourage to reroll runs to get the right combos. Some runs you will steamroll because of intentional hard counters, and others not so much.
Balancing the rewards for all 3 choices was difficult, I think fuck mechanically has the least incentive, but is also the 'sexy' reward so it balances out?
I love systems where your progress is visually shown to the player, and while the book also does that, I wanted something much easier to see at a glance for the player to be like "oh i still need to marry 2 more"
I wanted to make something for the all marry run as you suggested, but I was already waaaay over scope as it was. I also wanted unique marry CGs and male variants of all the monsters. I still want to do that, but I need to step back and consider if I want to and how to further expand this game.