I decided to watch Pupa after seeing it on an interest stack for incest animes. Though I really enjoy horror and guro, I didn't watch this with particularly high expectations due to its extremely low score. However, it surpassed my expectations.
The anime is fast paced, but I don't really mind that. I really enjoyed the gore, especially the scenes of Yume cannabilising her brother.
I don't really understand the low score. I theorise it's because of the incest and heavy gore, plus a lot of people might not like the pacing and short length of the episodes, but I actually really liked the length, it made it a light watch.
I highly recommend the anime for gore and eroguro enjoyers, though it's definitely not for everyone