This VN had me cackling the whole time. The humor was very well done, and I loved how self-aware both the main character and Zack were.
The endings were freaking great. (Snitches Get Stockholm Syndrome made me wheeze, similarly to the commenter below xD)
I also loved that we were able to befriend Zack (and possibly be more!)
Zack was such an adorable character (both art-wise and personality-wise), in spite of being a murderer.
I'd honestly love to know more about him and his sister! And I'd love to see more of Zack in general. He seems like a really fun character.
Even if you don't do more with Zack at some point, this was a fun little experience!
It was refreshing to play an overtly silly murder boy visual novel, and I'll definitely have to check out your other visual novels too ^-^