Earlier quoted context omitted.
Isn't it like those ill-defined puzzles where you need to say what number comes next? Any number can come next.
Pretty much this. It isn't a very good game. It's padded to kingdom come, there is a lack of motivation to keep going and no music kills any atmosphere it might potentially create.
I understand your point about filler, but the puzzles are the game, and if you're enjoying them then it probably doesn't come across as filler, just more to get stuck in with (though I do wonder whether so many slight variations on a theme are required in certain areas).
Hyped it may be, but that doesn't mean that you absolutely have to enjoy it at all costs. There are other games, and other developers :)