I've played Child of Eden some months ago, after an extended period of reticence. It was very pleasurable. At times it was truly remarkable, even. Far from being my favorite Mizuguchi but still very respectable in the way it adhered to a distinctive J-Pop aesthetic. Some levels were overly demanding, I agree with you. Still, the dying "gamer" in me didn't give me peace until I saw the end of it. I wished he hadn't tried to appeal to Rez fans so much, or at least not so directly.
PixelJunk games are always too gamey, don't you think? Even Eden, in spite of the wonderful visual design, was too desperate to embody that indie revivalist ideal. I played it for a few levels but eventually gave up. 4am has no difficulty, no challenges, nothing. It's just the player, the audience, and a set of sounds that can be manipulated to create music and light up the screen! I hope you enjoy it!