That Ghostbusters theme music always gets me. I especially love how they come back as ghosts. It was pretty clever to have him return as a ghost too. The animation wasn't bad. You have gotten better. The pacing was good.
I was thinking the hockey mask guy would just be a gag. I'm glad it was the plot. This really did set up tension well. I don't really know how ghosts work. EW's a weird acronym.