Version tested: v0.451
This review is based on my opinion alone. It's not meant as a personal attack the developer(s).
Let me get this out of the way: I really wish this game was better, because I actually like this sort of kinky smut. I don't always need romance and a complex plot and interpersonal relationships. But even as a fun romp of porn, the game doesn't live up to its potential. So I'll try to be at least a bit constructive with my criticism in the vague hopes that it'll improve in the future.
1. The storyline itself isn't awful, per se. It's standard fantasy lore and servicable. However, the writing is so poor that it's practically better to just skip it all. So my suggestion to the developer(s) is: find someone who will collaborate with you. Find someone who'll write for you or at least rewrite.
Or work your writing, if you prefer to go it alone.
Ren'Py is a platform for visual novels. As in: stories. If you can't write, you're better off just making a 3D-Comic or artwork. Good writing can make up for a lot of shortcomings. If you can't do animation, good writing can fill in the gaps and describe even the things your readers don't get to see.
2. The artwork will probably not be to everyones taste, but again, I think I've seen worse and the scenes are just naughty enough to be good for porn.
The porn content is certainly this title's strong point.
That isn't to say, that there are any problems. The "animations" (if you want to call them that) are just too jumpy and the poses and facial expressions look exaggerated and awkward.
3. Now, if the artwork is a bit awkward and the writing isn't ideal, at the very least the gameplay should be painless. Unfortunately, it isn't.
And here's my biggest complaint: the game features grinding. Even as an opponent of grinding as gameplay, I admit that it can be done right (if the grinding itself is fun in some way or if it's rich in variety). But here, looking for ingredients for potions seems like such a waste of time. Collecting mushrooms and flowers is pure padding to stretch out what could be short visual novel.
As for the combat (yes, somehow it has that, too):
I have yet to see a good battle system in Ren'py and this is certainly no exception. People too often try to emulate the old JRPG turn-based battle system without recognizing its depth and so they just copy paste the most superficial aspects of the system (the taking of turns) while ignoring what made those battles interesting. If you just have to have a battle system in your game, you're much better off using RPG Maker.
And that's my advice: Switch to RPG Maker if you want to go all in on the grinding&combat gameplay.
Otherwise, just drop it altogether and focus more on the visual & the novel part of the game.