The game itself is a few years old, and the active player base is nowhere near some of the other popular ARPGs, so the available community is smaller. Still, if you're looking for people to chat with, I'd suggest the Discord server is the place to start first. The subreddit is about the same activity as this official forum, but the quality can be different (on average it may not be better, but IMO the best threads from reddit are more helpful than the best threads here). That said, this forum is probably the best place to get responses from Neocore itself, so it has that going for it. The steam forum is definitely active, but it's pretty low-quality in my view.

Hope that helps!