Great choice of instrumentation! You manage to create a spooky mood instantly. The overall structure and each section complement each other nicely and I like how many of the instruments each gets a chance to shine with your orchestration. There are a lot of synth/layered sounds in the background that give depth.
For some reason, though I did find some parts sound more "piratey" and after thinking/listening I find the melody resembles Pirates of The Carribean, but that might just be a me-problem. I also feel like the piece moves between spooky and fun/playful, not saying Halloween and spookiness have to be dark all the time. Definitely high-energy, but maybe not epic (at least for me).
The more I listen to your piece the better it gets and I rate this very high. I'll be looking forward to hearing more from you!