Not gonna post this yet in reviews since the game is HEAVILY under developed.
I'm gonna mention some things already mentioned:
The plot is absolutely forgotten, the main story doesn't feel like it's ever moving forward, side quests have been getting pretty boring and just tedious in all honesty.
The navigation is absolute shit, moving around is honestly kind of annoying, it's so ass that everytime I need to progress I get stuck with my own thoughts and start thinking about life which I'm not really happy to be doing.
The corruption takes way too long, by that, I mean there isn't an easier way to grind them, nor are they conveniently placed. And I may take the blame here but I was doing a pure run(Low perversion, I literally started over because I saw a single perversion on Cassiel but then when I started over I saw it again so I had no choice but to just go over it. Either way doesn't matter anymore)
The two character system is alright in all honesty, but not at the same time. It just kind of sucks you can only change by sleeping. I have an idea for this however, I feel like this should be done similarly to how the Halloween event handled it. Would be fun too if there is some kind of way to like, have each character interact with each other or even tag along. But I'm not gonna get into too many details right now, I'm fucking lazy.
I also want to add, the combat in this game feels so random. It hardly serves a purpose other than being a thing that's just there. Only solution is to either just remove the combat or improve more combat opportunities and systems.
Need to mention no gallery too so you're stuck needing to save before doing anything lewd if you want to replay them.
This whole entire thing gets even worse because of whatever the fuck is going on with this Ren'Py update I have lagging the fuck out everytime I have to pick an option between dialogues.
The game is way too big for the experience.
TL;DR
Plot despite affecting the world massively, doesn't feel so big and turns out to just be a reason for the two to be in the human world
Navigation kind of exhausting. Please attempt a better navigation system
Corruption is also tedious thanks to navigation and grinding it is too tedious
Character switching system can be done miles better
Combat is too random or irrelevant and could be improved or just scrap.
No gallery
Game size too big, maybe compress it a bit better?
I'm not really smart enough to know how to or to fix any of these.
Ren'Py version fucked up with optimization.