Ignoring the fact that the dialogue is m ore stilted than usual and there's a few crappy lampshade moments I think the biggest problem with this script is that Enter cannot write horror scenes without having some crappy comedy happen after it. It reminds me of a crappy play I did in the fifth grade where every scary or threatening moment was ruined by the play's super annoying comic relief farting/sneezing/blowing his nose/burping/farting even louder in order to add some "comedy" to the material. You can have comedic moments in Halloween specials (Grinch Night and Ed, Edd n Eddy's Boo-Ha-Ha have some excellent ones) but they have to 1) Be Funny and 2) not be something that distracts from the Horror, Creepiness, scariness, etc.
It says something that Thomas the Tank Engine's Halloween Special is way scarier than Ryker's Revenge and keep in mind it's made for toddlers. (By the way if you're wondering how Scary Ghost train is, allow me to show you a still image from that episode.
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It's pretty sad an almost forty year old preschool show can beat Enter