Just read through it too (except Extra). Also really enjoyed it.
As you say it definitely puches way above it's price point. There's a lot of CGs, animated character sprites, some other small animations, good BGM, and interactive sections.
Story-wise I enjoyed it. Sen and Neneko sure are an enjoyable oddball duo. The story is interesting, moves fast and goes places but it's all still very straightforward in the end - maybe a bit too much at times, like the villain motivations for example. Had some genuinely creepy moments too, and it's pretty dark.
It could have done without those 2 shower scenes though, they're tonally totally awkward and add odds with the rest,
Took me 4 and a half hours, the Extra section will add a bit to that. At 0,79€ it's a steal if you're looking for something short and interesting to read.