I just finished reading this and I have lots to say:

Spoiler alert

Great

Oto-hime is well done. It's a well-done, very tame yandere. She's well portrayed and the voice-actor, most of the time, did an excellent job in showing the soft-spokenness of her in contrast with her actions (when it was not excellent, it was good). I like a lot how the fact she's yandere appears over time and how it's revealed, with hints since very early.

OK

The co-workers were portrayed as fake bastards which allowed an interesting back and forth between wether Shimako was actually telling the truth or not.
They were also a good tool to enhance and diverse Oto-hime's personality.
The ending fits well for the buildup that the story has been bringing.

The bubbles are a nice touch.

Art style is incoherent. BG art, sprite art and CG art are disjoint and, from my perspective, it's as if the artists didn't do any communication to make it more cohesive. It doesn't stand out a lot but specially Oto-hime's detail level vs BG detail level does stand out.

Too bad that the coworkers didn't get to have complete sprites besides a silhouette.

NOPE

Shimako is, in my perspective, quite, with lack of better word, stupid. The actions, the options available, the thought process... If it wasn't for how interesting Oto-hime is and how cutely she's drawn, I think Shimako is really someone I'd avoid because of how much of a non-person she is. Countless times I felt like screaming to the screen for an option that would make sense... But it doesn't exist... After some time, it makes full sense it doesn't exist because it wouldn't make sense to Shimako's personality.

So so many actions narrated and not coded. Camera movements that could have been done, character movements that were not done, a couple more expressions for Oto-hime (is it because of lack of time? I understand if it is... Art takes time). I remember near the end, Shimako runs away but instead of zooming the camera out, Oto-hime is zoomed out. Also near the end, when Shimako is pushed in by the water, Oto-hime is zoomed in, instead of the camera zooming in.

WTF

So many menus asking for a choice. So many not-a-choice. So many seems to be a choice but it's not. It doesn't feel like a design choice. It feels more like to make the kinetic novel not feel like a kinetic novel when only a technicality at two points in the whole text makes it not a kinetic novel.

Overall

I reached the end and, I confess, it didn't really satisfy me. Even though, there are some parts that satisfied me, specially Oto-hime's portraial. Shimako... not really.

5 out of 10