I grew up watching "The Real Ghost Busters" animation series and I have to say that you really did a great job here, so many childhood memories (from the movies, too, of course) came back to me when I played / read your comic.
You handled the characters with a great love for detail and dialogue, I guess that's why so many people here on NG like your work so much :)
I had to laugh so hard when Peter asked "What took you so long" and Egon said "An endless sequence of stairs", I'm rather sure this is a pun about the old Nintendo game (where you had to climb endless staircases in every house...). Or just a coincidence?
Anyway, great work. I played this 2-3 times in a row to catch every joke, and I don't regret it.