First off, congrats on your first game ever made!!!
Second, what I haven't seen mentioned that was SUPER good, was the music. Whenever the pumpkin came to life hold...I was wearing headphones and it made hairs stand up on the back of my neck!
Also nice work on the models! Even though an outline shader on the vegetation would have been more work, I think it took away from the scary vibe slightly.
The ghost behavior got a bit wonky at times, one of them moved like it was being dragged along the ground horizontally, which was funny so I enjoyed it.