This is adorable and the animation is spot on. The voice acting and characterization is near perfect, and the visuals look like TV quality animation.
I especially like when the purple and red characters are ignoring the green guy in the kitchen, and the camera movement mimics that dynamic.
My only suggestion would be paying more attention to the framing- when they're talking over the Ouija board, the green guy is crammed too far to screen right, with all the dead space behind him.