Although there are dialogue options the main character isn't a blank slate; I think the main character doing non-consensual activities is out of character.
I very much like your vision for this game so far, it really does feel like you want this to be a proper game first and a porn game second. It's not everybody's cup of tea of course, some just want a quick wank, but I for one I'm invested in what you can make of this game.
I love your art style (I really like them pudgy women) though for the sake of variety, more noticeably varied body proportions down the line would allow more types of people to enjoy it too (or not! keep them thicc women coming
), and while I am also in the camp of monster-on-human sex being hot, I understand that this might not be the direction you wish to take this game in. I do feel like it's really hard to write women fucking monsters without them being... slutty about it in some capacity, I mean you just have to be some level of sexually deviant to want to fuck a monster to begin with! Which doesn't seem like the kind of characters you are writing here, at least not yet.
I personally like the way you are writing your characters so far, I like that MC is not a bastard, or rape-y for that matter, not that there's anything wrong with that archetype in a porn game, some of my favorite games have an MC like that, but a noble MC that is not an absolute moron and has a respectable level of self-awareness is often a breath of fresh air, so I support your decision to not cave in to the mainstream demand.
I also love the mystery dungeon gameplay, pretty fun and the fact that you're not locked in battles makes it easy to grind or skip enemies at your heart's content.
My feedback on the mechanics is just about the same as other people have pointed out so I won't bother repeating theirs, just quality of life stuff that I'm sure you're already addressing, the two most pressing matters for me are the hot spring not standing out enough, maybe add some plants or vines to the room to give it a more "Oasis of respite hidden in a dusty cave" feel to it?
And the menu navigation can get a bit cumbersome later on when you're stacked up on stuff, namely having to scroll up to find a specific item like the scroll of enchantment was just a little bit of a hassle, but that's also because I hoarded stuff instead of selling it hehe, maybe make the items that can't have +1 and such stackable? like the scrolls of enchantment, and a way to use them one after the other would be nice instead of having to scroll back to find the next one whenever you want to apply multiple ones to an item. It's just a minor inconvenience really, but it would be nice!
Other than that, great start to your game. Very excited to see what you have in store, keep up the good work!