I dig it, but the mood feels too bouncy/bright to be a horror, even for 80's synth style. To me it feels more like a "kid detective" tv show as opposed to "spooky 80's movie on halloween"
You mentioned you love Elfman, I would definitely listen to the "Tales from the Crypt" theme in regards to pace/mood. For me that's spot on when it comes to "spooky/horror with a playful edge"
Awesome stuff Harry!