i loved chaos head and i did like the ending. Even though, yes he did gain power suddenly, i liked how they executed it. The final showdown had more than just a staring contest...it was beautiful to see his thoughts develop, and he knew he be killed by the one he is trying to save(in one of the good endings, he died); And the detective bit, his death was...reasonable plot wise(the antagonist had no reason to keep him alive, and he was making a breakthrough in the case which had to be dealt with). One thing i liked about chaos head was the possible connections to steins gate, like the alpha world line dystopia could possibly be due to the events in chaos head taking a different route