I felt the same way.My take on the ending was...playing it safe? Ie. "not sure we'll get another season" kind of thing. Some minor cliff-hangers but if it ended here and now we'd all be pretty okay with it. Just the feeling I got.
This series blended so many great 80's elements. The wife and I don't watch "horror" movies but we really liked this.I enjoyed it for the 80's nostalgia. It was a bit slow at times, but the acting especially by the kids was good. It reminded me a bit of Super 8, but I think I liked Super 8 more. As for a season 2, I would rather they do a whole new story and timeline. Kinda like they did with True Detective.