I usually like the style/feel of Kegani Labs games, with one exception, they basically have two routes: Keep the girl (mostly) pure as you clear the game, marry and live happily ever after or whatever I guess. Basically, MC is kind of a prude, on top of being sexually inept leading to the NTR route, were the girl gets "corrupted" and debauched.
Personally, I enjoy hentai games for the debauchery, unless you're going for a compelling, well-written story and all-rounder game with some nice vanilla. But that's a lot of work and no longer just focusing on what's basically an engaging fap. So I would propose including some mechanics for possibly "winning your target girl (or girls, if harem is going to be a thing) back".
So basically you might see three or four routes:
The two standard Kegani Labs routes: Pure Love/somewhat vanilla end and total cuck end where you/MC can't satisfy the girl's sexual desire at all.
Potentially two additional routes: You upgrade your "sex skills" (lot of options available if you're going with a psychic powers theme) and are able to become the person who is actually able to satisfy them so in the end, you "win the girl" and they stick with you (no NTR, more or less monogamy or some such). Or you upgrade your sex skills AND become more open to the idea of sharing and go more of a swingers route.
Pros: you'd definitely reach a wider audience with multiple routes like this available. I personally don't care much for NTR from the cucked's perspective but from the "girl gets corrupted and wildly delights in sexual escapades" perspective.
Cons: this would, admittedly, be considerably more writing, coding, and scene creation on your part. So I can totally understand if that doesn't appeal to you, you'd just not find it worth it. Making a game you can stay interested in and finish well would be far better than a half-assed game with a bunch of stuff you don't care about just cus you were trying to expand your audience.
Good luck, and I like what I see so far! Pixel art isn't my favorite but as long as dialogue, general story, and gameplay are up to par they can be plenty hot.