Wow, this game was much better than I expected when going in a 0.01 version. There are only two things I can think of that I'd really want gameplay wise.
The first would be an even faster run button (maybe have normal speed be close to the current running speed and have running improve on that) since the maps are already pretty big and if you have 11 more girls on the way, presumably that means at least 11 new rooms, which could make travelling feel like a chore.
The other would be way more save spots. The scenes are all really good, so I found myself saving at new spots all the time. They were barely enough for this version, so especially without a gallery I don't want to imagine having to go through a more completed game with only those.
I also have a non-gameplay request although it's one that really far into the future. That is please allow us to submit to the heroines even if we win the bet. The idea of falling because you're unable to resist a woman's charms has always been alluring to me, but while playing through the Leah route I felt like I wanted to win more and more. Not because she was a boring character, on the contrary. I didn't want the MC to submit because he would fail what seems like an impossible bet and thus be contractually obligated to serve her. Instead I wanted him to prove that he could restrain his urges, that he could do anything he sets his mind to, but even with a world of infinite possibilities in front of him, there wasn't anything that he would enjoy more than submitting to her.
In any case, this is a wonderful game, I'm really looking forward to seeing more of it.