So, what's the deal with the Invis potion? I corrupted the oracle, forced a student to steal the potion, realized it wasn't enough, researched it in the book a few times, found out I needed a butterfly wing, captured a butterfly, added it to the potion and got a message that the potion was ready to go, then patrolled at night, and got the scene where it said I needed the invis potion, and it went on exactly as if I had no potion- no new options or anything. Nor is the potion left in my inventory. Did I go through all that nonsense for nothing?
Gameplay issues:
1. It's ridiculously limiting that you can only summon people to talk in the morning or check your goals in the moring, and only study the book at midday. It's fine to limit you to summoning the same person only once a day, but one person/day is silly. And the same goes with the book. Some restrictions make sense, but others serve only to make the game exceedingly grindy.
2. The "skip" functionality is terrible, not properly restricting skipping variations you haven't seen, while other times having to wait through 60+ second animations (Francine sauna, I'm looking at you!) for events you have to repeat multiple times.
3. The hint systems are terrible (the divinations of the future haven't changed since I've started the game), and what needs to be done to progress is a wild guessing game. Most of the hints about what to do are entirely premature- you need to do several other things before you can act on the hints provided, while the prerequisites are left to be discovered by chance without any hint or foreshadowing.
4. The not-so-random evening explorations, which appear to "cycle", while only allowing one per evening, when you need one event particularly to advance. When you've seen all except one, this is just STUPID grind.
5. The translation and/or writing is pretty awful. There is absolutely zero subtlety to the writing, it seems to be at a level a 14-year-old would concoct. It would be forgivable knowing english wasn't the author's native language, but given the other flaws, there's little to recommend looking past it.
I really wish I liked this game more. It has a lot of potential, but it's flaws make it more frustration than entertainment.