I've exhausted my talents, as I am a programmer and only rarely have dabbled in pixel art, so any comments or criticisms would be of great use.
You seem to have a good eye for it anyway!
I've missed the boat again, but I already made some notes so I’ll post ‘em, may be relevant to the new plan:
Really liked the dark clock & beams, I know they could be a little strong for the background but finding a way to make them work could be worth it; just more highly coloured characters might do it, but the idea of a toy-like feel brought to mind a sorta diorama effect that I think some 2D Kirby game did before, (can’t remember off-hand, more recently in
Little Big Planet anyway).
Just casting close shadows of the foreground stuff (on multiply bending or similar) could push them off the background and emphasise that miniature feel, the strings and stuff are pretty cute too.


I think I might have seen some toy trees made on a lathe like a stack of cones, the current does bring to mind a slightly mechanical drill or bottle-brush feel.
I made this diagram for various side-scroller contrast strategies and stuff a little while back:
