It might just be me, but I found it very hard to try and figure out were to go in each level.
The sunglasses were the hardest to find, in the first level, I only found them by accident after the third lap of the city.
The subway level was hard, but it gave me a chance to learn I could loop around the invisible ghost(?) that represents depression(?) and run by.
The ghost was hard to out run in the house level where the phone is ringing. Even knowing which doors I needed to go through I could not out run it. I think the rooms were too small to loop the ghost around, so I couldn't find a way to find my way out of that level.