To sum up their Tumbler post, they state that they hate the project and the characters, and they think it's childish, the characters are badly written, and everything is just really silly.
Honestly as a creative who's seen near-identical textwalls maybe 20 times, and is about 10 years older than the average Tumblr age, I don't think that's the VN and its concept's fault it just seems like a self doubt crashout.
Hopefully the project files are intact for a minor rewrite after this passes.