Just gave this a play, you got some good stuff in there.  The environment has lots of detail and the dog controller and camera work well.  

I searched all over but unfortunately, I couldn't find Paul.  The first character I found was Muriel the cow, then a bit later the FBI characters who triggered the forest objective.  I found the cups which lead to the bushes but couldn't find anything more after that.  I think it would be good to add some floating markers above the things you can interact with, otherwise the player has to try and run into every detail on the map, just in case it triggers something.

Also, maybe change the arrow shaped dialogue button into a regular shaped button.  When I first met the cow, I thought I was stuck.  I was pressing everything on the keyboard and clicking everywhere to move the dialogue on before I accidentally clicked the arrow.  I thought the arrow just meant there was more dialogue to follow.

Hope this was helpful!