To start off, Roundscape isn't a porn game. This is an old-school JRPG with adult content. If you're just playing it to fap then stop now and go check out something else.
Now, for a RPG, Roundscape is a bit of a mixed bag. The game does many things, but it does too much and sort of half-ass everything.
World building
Better than most RPG Maker games but still insufficient. The game uses a lot of fantasy clichés, such as tribal orcs known to raid and pillage, isolationist elves living in forests, underground-dwelling dwarves good at smithing, etc. It also features the usual "Christianity with a polytheist flavor" you see so often in fantasy settings. Occasionally you get a deeper insight about how the various communities work but it's often by the way of a big infodump given a single character. There's a distinct lack of show, don't tell in that the game's towns are little more than backgrounds for quests with a serious lack of any sort of environnmental storytelling or even NPCs of note.
Characters
A lot of Roundscape characters share a flaw: their lack of distinct voice. Party members fare a bit better than the rest, particularly the Succubus, Roderick and Kathlyn. Others tend to be a bit samey aside from the occasional quirk or superficial trait. NPCs are especially bad with this, to the point you would sometimes be completely incapable of recognizing the speaker without their portrait and name above the text box.
Gameplay
Roundscape has a lot of combat. Maps are relatively small and often feature several enemies bee-lining for you as soon as you cross their (mercifully small) field of vision. Furthermore escaping doesn't disable your collision box, meaning you often re-start combat immediately after. This is a serious issue, because combat in Roundscape sucks. It's either a trivial affair or (particularly in higher difficulties) a matter of whittling down monstrous damage sponges. Skills are useless in the majority of cases: all you need to do is stack damage boosters attachments on your equipment and attack. If a character can't dual-wield, they're useless too, because they have less slots to enhance their damage. Enemies, even bosses, never do anything interesting and just use one or two attacks over and over.
Story
Pretty standard: find relics to defeat the evil god. Nothing wrong with that. The execution isn't terrible but it's not particularly good either. It's adequate. At least until Act III, the final act, which is a terrible mess but fortunately much shorter than the rest of the game.
Graphics
A real strong point. Roundscape really managed to avoid one of the worst issues with post-XP RPG Maker: the garish, square maps. Good use of tints and fogs to avoid being too cartoonish, heavy use of parallaxes to smooth out the edges of every tile... UI elements are pretty okay too.
Porn CGs are hit or miss. Multiple artists contributed and while it's mostly a question of personal taste a few of the older art pieces are simply bad. They're a minority though.
Conclusion
Roundscape is average. It has porn but far less that pure porn games and it's gated behind a RPG Maker game that isn't as good as those without sexual content. The whole package is heavily flawed, but not un-enjoyable either. It's, well, average. The game equivalent of a jack-of-all-trades, master of none.
Now, for a RPG, Roundscape is a bit of a mixed bag. The game does many things, but it does too much and sort of half-ass everything.
World building
Better than most RPG Maker games but still insufficient. The game uses a lot of fantasy clichés, such as tribal orcs known to raid and pillage, isolationist elves living in forests, underground-dwelling dwarves good at smithing, etc. It also features the usual "Christianity with a polytheist flavor" you see so often in fantasy settings. Occasionally you get a deeper insight about how the various communities work but it's often by the way of a big infodump given a single character. There's a distinct lack of show, don't tell in that the game's towns are little more than backgrounds for quests with a serious lack of any sort of environnmental storytelling or even NPCs of note.
Characters
A lot of Roundscape characters share a flaw: their lack of distinct voice. Party members fare a bit better than the rest, particularly the Succubus, Roderick and Kathlyn. Others tend to be a bit samey aside from the occasional quirk or superficial trait. NPCs are especially bad with this, to the point you would sometimes be completely incapable of recognizing the speaker without their portrait and name above the text box.
Gameplay
Roundscape has a lot of combat. Maps are relatively small and often feature several enemies bee-lining for you as soon as you cross their (mercifully small) field of vision. Furthermore escaping doesn't disable your collision box, meaning you often re-start combat immediately after. This is a serious issue, because combat in Roundscape sucks. It's either a trivial affair or (particularly in higher difficulties) a matter of whittling down monstrous damage sponges. Skills are useless in the majority of cases: all you need to do is stack damage boosters attachments on your equipment and attack. If a character can't dual-wield, they're useless too, because they have less slots to enhance their damage. Enemies, even bosses, never do anything interesting and just use one or two attacks over and over.
Story
Pretty standard: find relics to defeat the evil god. Nothing wrong with that. The execution isn't terrible but it's not particularly good either. It's adequate. At least until Act III, the final act, which is a terrible mess but fortunately much shorter than the rest of the game.
Graphics
A real strong point. Roundscape really managed to avoid one of the worst issues with post-XP RPG Maker: the garish, square maps. Good use of tints and fogs to avoid being too cartoonish, heavy use of parallaxes to smooth out the edges of every tile... UI elements are pretty okay too.
Porn CGs are hit or miss. Multiple artists contributed and while it's mostly a question of personal taste a few of the older art pieces are simply bad. They're a minority though.
Conclusion
Roundscape is average. It has porn but far less that pure porn games and it's gated behind a RPG Maker game that isn't as good as those without sexual content. The whole package is heavily flawed, but not un-enjoyable either. It's, well, average. The game equivalent of a jack-of-all-trades, master of none.