While this wasn't EXACTLY close to Ghoul School technically, this did have the FEEL of the original animation (especially jokes pacing-wise). At first, the charas. didn't seem to look too much like the originals, but then I just chalk that up to "an update".
The ending number reminded me of a certain musical segment from a certain animated show on Cartoon Network.... in fact, the ending was 40% 80's pop culture music video, 40% meta-parody (parody WITHIN a parody), and a sweet, sweet 20% of charming chuckle-worthiness. (^_-, ^_-, nudge, nudge). And the charas. seem really likeable enough for a sequel/series.
Awesome throwback flash!