There's a couple of things going on here:
1) The feedback being provided is high-level, in-depth stuff: none of it is intended as an attack on you, nor really on your concept. What it is intended to do is highlight potential issues going forward, giving you a chance to address them or not as appropriate.
2) You enthusiasm is appreciate, as a community it would be nice to be seen in a less automatically negative light; I think the AB end of the spectrum is getting there, to an extent, with things like footie sleepers for women and adult story-times. DL, on the other hand, I think will always be a bit in the shadows, much like BDSM. And for many of the same reasons - by definition DL is sexually oriented.
At least to me, your initial commentary suggested the entire story was taking place inside the confines of the tribe (one resembling Greek Myth I thought), not that the tribe was entirely ABDL and under attack by outside forces. I think a more subtle approach has a better chance of bearing fruit: I would argue it's fine to have ABDL characters and not shy away from showing those aspects of personality. But we're not just ABDLs, we're any number of other things, too. I argue that focusing solely on the ABDL aspects does everyone a disservice: Us, as it reduces the community back to a single trait, and everyone else because it makes it hard for them to identify with the characters.
As a suggestion, I'd establish a compelling story first. The story doesn't have to be ABDL-centric. Let's explore that a touch: conflict is Max's boyfriend, Jack, has been kidnapped, apparently at random (note that I don't support bad guys as "Evil for the lulz!"). Naturally, Max is concerned, wants to get him back. Max sets out to try and follow the trail, but first he has to make sure he's got everything he'll need for an extended journey: video game logic, he needs to clear a short dungeon to get his clothes and supplies: binky, blankie, plush, sleeping bag, tent. Now he's free to head out of town, but now his childhood friend Jane has heard the news and insists on coming along. Jane doesn't know that Max is ABDL, but he needs help, so along she comes.
We skip over the next three or four town and two dungeons, and reach a dramatic scene were Max gets badly injured saving Jane. Naturally she's going to take care of him as he recovers. Blatant scene, she finds out about the ABDL stuff, we reveal that Jack isn't just the boyfriend, he's also the care-giver in this dynamic. Depending on how Jane is written, one of two things happens here: a discussion followed by acceptance OR Jane retreats in confusion to work her way through this revelation. We'll go with the latter case, and we split off into a side story following Jane as she works her way through her immediate rejection of Max. We're doing this because it gives us a chance to line up and knock down some of the more common misconceptions and myths. So, Jane wanders back to the last town, where, naturally, someone saw the fight and the revelation. Max's predilections are now the talk of the town. Jane has to compare the blatantly negative commentary with her actual experience.
What makes this tricky is we're going to have to script the entire game to this point with this section in mind: we need plenty of counter-examples from Max of WHY the townspeople are wrong, ones that Jane has been seen to have witnessed. For verisimilitude, this will require flashbacks previously. Now we return to those same scenes, but with a shift of perspective revealing that Max was, in fact, being ABDL at the time and Jane just overlooked it. For the player, we'll need to have liberally seeded preceding events with indications of Max being ABDL, things like the plush being a necessary item for leaving, an event drinking event where he seems to have an improbably large bladder, maybe the binky serves as a status recovery item only for Max, etc. Depending on how skilled you feel with scripting, we could set it up so the player has to process along with Jane, making choices that indicate opinion one way or the other. As the local version of God, naturally the plot won't progress until she accepts Max for who he is. Story continues . . . .
With the exception the last sequence, you'll notice none of it was blatant or in your face about ABDL. Based on my decades of life, I see this more subtle exposure being much more effective.