I know it's June, but many of my friends are already like, "it's the spooky season!" and, honestly, I'm on board with that and it seems to be something I've noticed in the gaming world. Take Septima, for example. It's not technically a Halloween-based game, but you are getting yourself a coven of witches together to influence townfolk. That's pretty spooky season. The game is up on Kickstarter now.
From the campaign:
In Septima, you play through four Seasons, each consisting of five rounds, to gather a powerful coven of Witches and gain enough Wisdom points to become the worthy successor of the High Witch. You will accumulate Wisdom as you practice your craft in the superstitious town of Noctenburg: gather ingredients, brew powerful Potions, perform Rituals, heal the afflicted, and work in the shadows to turn suspicion and anger into support and acceptance.
The campaign's around 5x funded with 14 days left to go.