Ultimately, I hope this can gather at least a small following and take my code to grow independent from me. Eventually I'd like to do this full time but I have to be realistic that a small niche thing like this, shipped with real porn, can never be monetised. Not trying to grow rich, something to eat and steady supply of coffee would be enough, but I have to pay my bills.
So my plan for 1.0 is to have this project robust enough that a community however small, can take the source code, make their own versions of it or just steal some javascript for their own HTML games (as far as applicable, I'm fully aware that me using React is pretty unique). Or just continue making mods. And I'll be off to smarter projects I can actually earn a living from, if people like my work that is.
I'm going to have to disagree a bit... You can monetize it, hell, you could monetize it NOW if you wanted to. X-change-life has real porn in it, way more than cock roulette, or just as much.
X-change-life is monetized by subscriberstar. (Doesn't use patreon.)
You promote your game, have people play 4.0, and use the subscriberstar to give constant updates on development and ask your subscribers for suggestions/etc.
Maybe not a ton of people would subscribe, but maybe some would. The game just needs traction. I have never seen an interactive joi game like this one. It can cover a lot of "gameplay" types with mods and more "modes". Like, a fap to the beat mode for X amount of time without orgasming. Or a mode for a specific actress/etc.
My point is that you can monetize this the same way X-change-life charges a bit on Subscriberstar.
You can ask Aphrodite for advice. (The dev of that game.)
Who knows, if you get enough people subscribed, the game could afford to have more added to it.
I would rather that, than you doing this for free with no reward.