He has gone over many time why Enhancements are less likely in future. Look through the comments and you'll find plenty of other people asking the same question.
TastesUndivided
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Second this. It would be cool, but adding boobs took a long time because Kal needed to redraw Melo in every single previous art piece he was in where the boobs where available. It also meant every future art piece he makes needs a boob version as well, adding more time to the process.
Adding even more options and variations is just gonna clog development even further. This game doesn't have fixed character models that allows you to add cosmetics that can work in every scene. The characters are redrawn from scratch every time, because they need to be seen from different angles, have different expressions and do different poses. Cosmetic customisation is almost incompatible with this game.
That's actually something a lot of people have been asking for. Considering how much work it was to give Melo tits though, it sounds like giving him a big dick, big ass or just making him taller would be even harder.
I hope he can get it as a semi-temporary transformation of some sort. Sounds like a way to do it without needing Kal to redraw pretty much EVERYTHING.
Syd, Kal, Azul, Zaine, Koga, your landlady and everyone at the Vore Center (maybe some I'm missing) all have at least one scene where they can eat you and you get let out later. All of those do however have a risk of getting you digested though (or unbirthed by Seras in Azul's case), depending on your choices, so there is no completely safe vore scene.
I'm just gonna go ahead and awkwardly ramble about my random ideas of being able to romance a Micro.
What if you dated a Micro and had the ability to devour them with oral anal and cock vore, but instead of doing QTEs to not get digested, you have to do them to resist digesting the prey. And much like with Syd, you could at one point have a conversation with them where you tell them they'll get digested next time you eat them.
And if you do digest them, you can either leave it be, to make it permanent, or click on the Belial statue to have them return with no memories of what happened (same would go for Melo of course).
Thanks for reading if you did.