The most direct analogue would be Legend of Queen Opala series. I think they use VX Ace RPGM engine, not MV, but gameplay-wise they are probably the closest to Roundscape there is. Open-world RPG with some grind and story to it, though there are like 10 times less scenes. There could be possibly few-hours gaps between 'em during your play.
This series features several complete game.
There is game called Noxian Nights, another one on VX Ace, though the gameplay there is more of: "get there, do this" and less of an open world roaming. Features LoL characters, has some nice scenes, most of which are non-con with humans, monsters and beasts. Gameplay is kinda slow. Also, it shares developer with Kingdom of Deception, if this tickles your fancy.
This game is complete.
Black Souls dilogy (VX Ace) is more or less close to Roundscape. Although it has... even less SFW scenes (lots-a-rape and scenes with minors, I think?) and is focused on its absolutely mind-fuck and dark as fuck story. And its gameplay is a case of lots-a-rape - of you, the player, for it is hard and grindy. And it also has Dark Souls mechanics, if the name of the game wasn't clear enough of an indication. FIY, there exist 10,5 hours review of Black Souls 2 in Russian, and its not a let's play - just a re-tale of the story. Yes, its that massive and convoluted. No idea if this one is your cup of tea - its definitely not mine, and I haven't played it. But its there and its (in)famous for a reason - a lot of reasons, actually.
This dilogy is complete.
Speaking of a devil (of soulslikes) - the next on the list is Heart of Darkness. Again, engine is VX Ace, I think. I also think its as close of a soulslike as you can feasibly get in RPGM. Has curious fighting mechanic where you level up the spirits of champions of the past (basically, local equivalent of friendly phantoms from Dark Souls). And just like the previous game, this one is dark as fuck and its scenes are 90% rape, I think? Sometimes with non-humans? Its not very long though.
This one is complete too.
And of a devil of dark games - LonaRPG, I think, technically qualifies too. But I will leave it to someone else to explain what absolute dark-fantasy pedo-priests fuckery is that game. No, sir (lady?) - I won't delve into it. The only savory thing to arise from this game is this picture of Letthanya. Yes, this post is officially approved by the FootFagAssociation.
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Jokes aside, despite... let's say, questionable contents and themes, LonaPRG is fucking legend. Though if you can stomach dark-fantasy BS that is everything in it, that is.
This one is not complete - and who the fuck knows when it will be.
Moving next, there is, of course, The Last Sovereign. In a lot of ways different, in a lot of ways similar - grindier, less of an open world, more or less regular RPGM at core. Scenes-wise its succubi this, succubi that and a few other bits inbetween - a heaven for demon-girl lover, pun intended. Story-wise? Fuck! Its a deconstruction of the Chosen-One stories, mixed with a lot of political drama. Not a combination anyone would expect, yet it somehow works just fine. That is - if you are willing to read through "War and Peace"-worth of dialogues about demon lord politician-ing against one another.
I think this one is still work-in-progress?
Claire Quest is the next. Another RPGM (don't remember the engine though) game, with less focus on battles and more focus on quests, sometimes with a lot of ways in which to complete them. I think, it even lacks traditional combat system and the encounters are passed through skill or item checks. Solid plot, solid quests, solid art, tons of very varied scenes.
Its a WIP with a long way to go still.
From the same devs came the Overgrown: Genesis. Now instead of a fantasy it features a modern-day setting - apocalypse of rape-zombies and rape-mutants that may include tentacly-plants! Same as previous, solid plot, solid quests, solid art, tons of very varied scenes. Though the good ending is locked behind completing all the side missions, whiiiiiich kiiiiiiinda can be a hassle. Gameplay-wise, it has survival elements to it (resources in this game are very limited) and even a top-down shooter. Yes, you beat your enemies not by skill-checks or combat system, but by shooting the actual guns at them in real time! Well, as long as you have ammo and your foes are not fast enough. Yes, they will rape you unto game-over upon catching.
Unlike the previous one, this game is complete.
To add a few more examples, there are Third Crisis, which is a sci-fi with interesting combat system, and Detective Girl in Steampunk world, in which the title kinda spoils the contents and the way you play through. Though the latter has some very brain-dead moments that makes you question the devs logic and sanity. Like how you can complete a sidequest only by using seduction, which you can learn at the brothel, which requires you to... LOWER THE INTELLIGENCE OF YOUR GIRL-PROTAG THROUGH MASTURBATION. And that is not the punchline. Punchline is the fact that getting it low enough will take you clicking the option several dozens of times, each time going through the same stuff over and over. But apart from this little lol, I don't have much to say about these two games.
Both games are WIP, in case of Third Crisis - early stages WIP, I think.
So, how about this laundry list of recs with a foot-fetish pic to boot?
