Neat concept! The uncanny valley art style of the characters made it all look a bit creepy (in a good way). A bit more could be done to distinguish the non-solid background objects from the foreground objects you can collide with, but I liked it nonetheless.

And I've gotta echo what was said below about the enemies being a bit too strong, especially with there not being much indication as to when they'll do damage.

Its a neat idea, though the enemies are a tad strong, and I'm not too sure if the upside down world and the main world are too related?

Candy collecting is fun, although enemies are a bit op. 

Phasing through walls is interesting.

good game