I really hope you are wrong. Otherwise it's just another great story ruined by it's own (rushed or nearly there) endings.
There is way too much to tie up. Characters, secrets and etc to end like that. So yeah I hope you're very wrong. But this dev was a part of ruining Haley's story so sadly you're probably right.
Wish devs were forced to learn how to make good endings before they could release a vn. Most devs suck at it...
		
		
	 
It's the typical "I'll go where the story leads me" mentality. That 
does actually work somewhat, but it's extremely limited. Basically, if there's a scene that you have a high-level idea about, such as the outcome of the scene, the specifics (what exactly is said, how everything during a fight happens to reach a known result, etc.) 
can be fleshed out as it comes to you. However, 
not everyone can do that successfully (most cannot), and even when they can, applying that approach to an entire story never works.
It's like taking something you write during NaNoWriMo and refusing to edit it afterward. The stream-of-consciousness is great for getting a bunch of what you want on paper (or virtual paper) so you have a framework with which to work. It's absolutely terrible, though, for anyone but the author or possibly another writer to read. This is one reason why many VNs fail. Other reasons, of course, include arrogance and/or unrealistic expectations, lack of motivation to get through a huge undertaking, etc. But you can tell that with many of them the real reason for failure is the author simply fails to plan anything to the end. VNs like 
Eye of the Storm, 
Life with Pleasure, and 
Pantyhoes are just a few victims of bad planning.