I can definitely hear the Nintendo influence on this and works well to add a whimsical element to the Halloween vibe. I do admit though that I agree with PerLonn, the melody, especially towards the beginning is slightly pirate-like but I think it eventually becomes more Halloween as the track goes on.
I also love the theremin lines; definitely a classic and it really brings home the Halloween aesthetic.
The bass part was also really well produced and written. This was really fun to listen to and I'm looking forward to hearing more music from you in the future!
Great job!