I don't think Jiken is purposely delaying the next update just to raise more money.
To be honest, I don't think he has the slightest idea where the plot he's created is going.
This is a very common problem among developers of this type of games (adult games). They have very ambitious ideas and they end up paying the price sooner or later.
If you notice the games on this forum that are already complete are games that have a relatively simple plot and a very limited cast of characters.
The recipe for success is based on:
● An MC, a mother and a sister or two.
● An MC and only one mother.
● An MC, a mother an aunt.
● An MC and a sister.
● An MC and a love interest.
In short... games that have a large number of characters in the cast almost never live long enough to be complete.
So here's an appeal... If you, future developer, are reading this post... Focus on creating a game with a simple plot and a small cast of characters that are memorable. Sometimes less is more.