I honestly loved it. Been waiting for every single chapter, since like chapter 30. I can agree with some points, but one can argue that everything can be somehow better.
The manga itself started great with some great original concepts, then turned amazing around the Miho arc, and fell off towards the Prez arc, then I think picked up at the ending.
The ending, I enjoyed it (honestly thought it would end like last volume), the lecture was quite an interesting perspective that got me thinking and I think I can get behind it. While there are left over unresolved plot points, I don't think they were super important to the story the author was trying to tell. A lot of it can be left to the imagination of the individual of how they continue. As for the yuri, I think that was mainly for the fanservice, this was mainly a mystery manga. A really fun and original one at that.