It is not one thing or another, but a whole complex feeling. But if you ask for specifics...
Some animated scenes, made rather poorly, since, for example, some body parts are made deformed, like strangely too long, to an unnatural extend, hip parts of the legs; noticeably dropping visual quality of the new characters; rather poor taste in dressing main character (what with his red pijama? And it's getting more and more screen time...); dragging from far off version story with gallery that dos not reflect seen scenes; this one arguable, but still, all new updates adds is several lines of text and couple of scenes, and other minor details. It is all this small things that give me the feeling of decline.
And, ofcourse, as the cherry on the top, the coroner stone, unkempt promises. I remember your (developer) explanations about pregnancy/evolving system, as well as 'sleeping over' content. I have no desire to go in argue and dance with words about that. But, I do feel deceived to an extend, most developers who implement "see in the next update function" actually put there content that they plan to implement in the next update, not that they "plan" to add some day or not at all. Besides, you implemented a "sleep with..." content, tho only with one girl and only in main character bed. So, there is no reason stopping you (developer), story wise or whatever, from honoring of at list part of your promises, why not concentrate on that and extend it. Add more girls (sleeping with two or three) as well as sneaking and sleeping with girls in their rooms (or not just sleeping).
I forsee that some hard fans would start throw dirt and other staff at me for criticism, but you (developer) asked for my opinion yourself and I honestly given it to you. Take it to account and use it to improve the game or just ignore it, is up to you (developer). In either way, I wish you good luck in developing, since this game really have potential and it's own appeal.
Mmmmm, the scenes because of the body parts, the only one I can think of with long lower limbs is Hell, but that's normal, she's not human. Of new characters, there are only Isabel and Aneko, but those are tastes, if you don't like this sweet kitty I can't do anything about it
And there would also be her coming
For more monstrous and complicated stuff, they're on the way, but I'm not going to show them around
The mc dress "pajama", is a simple sweater from a casual outfit at home.
I didn't understand the gallery one, it must show the lewd, for the story, there are event trackers.
Regarding "next updates", I beg to differ.
I just can't focus an entire build on just one feature, people are already starting to complain about the "lack of story".
I'm only doing this for 0.54, for testing interactives.
I can't randomly force sleeping with three people if the requirements aren't there.
The sleep with there is and is only with Asmedia for now in the room, but there is.
Don't expect a complete feature like that, it will be really complete when there will be all the girls, at the moment it will be updated slowly.
Now the new life, it will be the 10th time I repeat it, it is connected to the story and I can't force it in any way.
But that doesn't mean I'm not working on it behind the scenes, as I have always shown
Lately, it seems to me that people keep expecting more and more, without there being an effective balance between effort and return, I'm loaded with stuff to do, but it's not like I'm going to show it to you.
I don't have the support of CK or HHG, yet I am expected to do things at the same level.
Or that CoR can give nothing more or has nothing left to give when in reality you haven't seen anything yet.
By now the only thing you make me think is to disappear from the scene and come back in a couple of months with a giant build, which I can not afford to do because if not CoR ends up in oblivion.
Want even more? Then make it grow, expand, talk about it everywhere and let everyone try it.