I just started playing this today also.  Only a few missions in, but really enjoying it.  The amount of stuff you can interact with makes it a joy to play.  You can tell a lot of love went into the game.  
For example, I was cleaning up an area of a kitchen, and I released a bat.  The bat flew at me, and I thought I was under attack as what usually happens.  Then it quickly circled around, and it ran into the stove and incinerated.  Just a tiny moment that has no reason to be in the game except the devs probably thought it was funny.