Seeing the news about the updates and the DLC in this thread, I picked it up and played through it the last two days (100%ing the game again) and had an absolute blast. Really enjoyable experience, great work honestly. The DLC didn't seem to be released on DLSite, and Ichi.to seemed like a bad call since if more DLC gets released I'd have to buy the whole game again, so I went with Steam.
Difficulty is a slightly funny beast, since NG+ makes the game much, much easier than it was (and kind'a reduces the fun of having to really optimise yourself to get the harems) but hard mode does fix that, even if it removes the character portraits which were a huge improvement over having to remember all the various nodes and which ones were unique events at which times etc.
On the other hand though, the difficulty of getting the Ultimate Harem end is absolutely bonkers, way harder than the base game was without NG+. Unless there's a mechanic I'm missing, I don't believe it's possible to do without the time-flux, but there's no indication about how much you can use the time-flux before it kills you and it doesn't even kill you that same day, so you can't use it and test the day to see if it's safe. The fact that the entire run requires the use of a device that you'll only find through a pretty specific set of actions, and which you don't know how much you can use, or if your save is dead in the water since you'll die in two days is... very frustrating. It took me absolutely ages to get the ending and most of it felt like just slamming my head into a wall. I really think you could stand to add a bit more clarity or leeway there.
Only other issue is that the larger animated sex scenes, for some reason, sent my computer crashing to single digit FPS. Most of them played fine, but the 3some, 4some, or orgy ones turned into a choppy mess. I don't know if that's a case of RenPy not being built for that, or if it's on my computer (It can run modern games, I'd have to assume it can run a 400MB VN), or what's going on there- but an option to revert back to the non-animated scenes would be greatly appreciated for myself and anyone else in a similar boat.
Other than that, I really loved it, had a great time and I'll highly recommend it.