This game had a lot of potential a few years ago, there's even my old comment from years ago somewhere here, it's a pity that the dev didn't actually use its potential, it has a talent for art, a unique style, a rarity on this forum, unfortunately the dev burned out or it he just stuck in a stasis.
Advice? I'm not a chef, but I would focus on...
1. Throw away those dating cards? they are simply annoying and make it difficult to see the desired scene.
2. I would add more text/narrative to sex scenes with dating npcs and random ones, because really, with such a huge amount of sex art and so little narrative. (If a dev doesn't know how to write such things, even a random NSFW AI chat can do it do it for him)
3. Make the npcs more "colorful", "different" in terms of personalities and the way they speak (again, the npcs have a very poor narrative when it comes to dialogues better than sex-scenes but still lack)
4. Add specific "different" behaviors/habits to "different" breeds (more than just a 3 line sex scene)
5. Write quests better? because seriously, the theme that "some king tells you to close the portal" and that's it is really... poor.
5. Breeding, VERY cool mechanics, but the same as above, no narrative/variety, no consideration of anatomical breedings beyond the size of the "penis" (again POOR amount of text)
6. I won't talk about combat because it was never the strong or main aspect of the game, BUT during portal exploration, more DIFFERENT events would be useful. (Yes I know again, the remain events as well had a lack of narrative writen text)
To sum up: During all these years, this game basically had no narrative/text/plot/sex scenes and no attention was paid to it, maybe I've seen too much, maybe I'm asking too much, I don't know, but the art monster girls themselves are not as satisfying as on the PORN game after XXX time seeing the same art with lack of narrative.
All in all, my opinion should be thrown into the trash anyway, because, as I wrote, the dev is either burnt out or he just doesn't care as much as he used to, despite everything, I appreciate this game and even though I don't feel the need to play it because of what I mentioned above, I consider this game a hidden gem.
