Sorry, you were disappointed by the game, but as it says in the description, this is just an early access version; to show people the story and way of playing I'm trying with this VN.
The completed story is of course going to be much longer (aiming for 8-10 times longer!) and will have more routes, variety and player choice.
While the game might be five minutes if you click straight through from start to finish, you'll learn a lot more about the main characters (and others) if you explore other options during your play through. Plus, as the game continues to develop, there will be some exclusive CGs you can only get on cetain routes.
Length aside, I do hope you enjoyed Chan and Jakob's story, and will check back to see how it develops.