Using DepthOfField in a tribute game to Nimblz

I decided to try to use the depth of field to make these visuals look more beautiful in tribute games I created for Nimblz.

Those games are listed in order, starting with a Cosy Place. All the games have signs at some places you can try to find and read.


Nice game! I played it and it has nice visuals! Can you tell me how you did it?