I did have a problem with one of the IFs (IF means Imaginary Friend) in that every time a person was in front of them, it looked completely like the person was standing in front of a screen with the IF projected on it. Didn't have that problem with any of the other IFs, so it was weird and really ripped me out of the story.
There's no after-credits scene per se, but there is an acknowledgement at the very end that was nice. /2