As far as I have looked up LonaRPG has a really unique gameplay which I do not find anywhere. The closest would be Wings of Roldea which has similar mechanics, though the story is much more linear (and it's a female protag).
The best recommendation I can give is Degrees of Lewdity, which is a good sandbox, with the possibility of a male protag, though the art is only pixel.
I also wish we have games with similar gameplay and sandbox feeling, but the reality is thay most RPGM games are all turn-based combat jrpg with a linear story.
damn lol. if only i could finally motivate myself to start attempting to make a game!! i have so much free time, but no talent or motivation. in the meantime, i'll see if i've played any more open, ended games.
a few i'll throw here.
peasant's quest(open world/sandbox/adventure/rpg)
a struggle with sin(open world/sandbox/adventure/rpg) minor survival elements
arms devicer rio(linear, but branching Main quest, with many branching sidequests, and multiple endings. female MC only)
tl;dr
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1.Peasant's quest, which i think is.. okay. i like the late content way more than early, infact, i started getting addicted at the current end content. but the art, and writing is so-so. it improves. I also kinda like that you interact with, "play" with, and join some pretty cool groups. example is the 2 powerful opposing religious orders, with pretty cool new skills and abilities. they are mandatory as part of the main quest though. although, just like with a struggle with sin, the main quest feels no different from any other quest line, interaction or event in the game. it's seamless, with no feeling of railroading.
there are quite a few dungeons in this. but i found them a bit annoying. better than typical RPGM dungeons. they are small, and serve a clear purpose. but yeah.
And, this game is a bit grindy. not by RPGMaker standards, and probably not to jrpg fans. but for a western rpg fan, it's really grindy, though, and uses the boring vanilla class leveling. luckily. all of the skills, and unique abilities you learn from other characters, or events. which in my opinion is how all Roleplaying games should do it.
the game seems to focus on impregnation fantasy. which i gotta say, i didn't know i was so into, until i played. it also has others aswell. a couple NTR moments. (one girl accidentally has sex with werewolf instead of you, and goblin girl has sex with entire tribe on your wedding! lol, i'll leave you with those out of context moments.)
2.A struggle with sin. this ones much better written, and has far better quests(both writing, and gameplay), characters, and H scenes etc. and feels really open ended, and seamless.
great game, with also Much better dungeons, and encounters etc. the CG is still not great though. the MC, and his "father" in particular look facially deformed or monstrous lol, which does admittedly hurt the "content", and that's coming from a straight guy.
this one in particular is really hardcore in what i call adventure gameyness, with kinda obtuse questline progressions, and event triggering, that can only be done 1 Particular way. you had of completed a certain quest, or event, be friends with a certain person, have a certain item, say a certain thing, be in a certain place at a certain time, etc.
now, when i say obtuse. I mean like those old Point and click adventure games, or the few open ended japanese roleplaying games, where it feels impossible to progress without a guide. although, that could just be me. i've mostly played Western Computer rpg's, and roleplay focused console ones, like planescape torment, the dragon age and mass effect series, and all of the mainline elderscrolls games games after arena. and in those, it's generally clear what you want to do, and plausible to think of atleast 1 way of achieving that, even if that leaves you with a worse outcome.
you don't have to of fucked wendy, and broken into her money vault, for example, to be allowed to progress with mistress Belladonna, the domineering noble, 2 towns over.(not a real example).
now, this ones got an array of fetishes. alot of NTR aswell, although all optional.(never experienced any, but can easily see where it would be. and disabling NTR is in options.). most of it's focused on consensual sex, that you have to build a relationship for.
but yeah. both i finished just before trying this. they both use vanilla RPGM combat. but they have completely open gameplay. A struggle with sin i put as one of the ones i really really liked.
another potential recommendation, although it is linear(with many sidequests, all of which can be completed in so many ways, and have alot of different outcomes, that lead to other quests, services etc! and multiple endings).
is the female protagonist game arms devicer: rio.
i'll probably actually write a list in the tl;dr style later and quote you.
