I played the demo on steam, and without hyperbole, these are the worst camera controls I have ever experienced in a video game.
I'm sorry, I know game development is hard, and I deeply respect the effort that must have gone into making this, but I simply cannot play this game in it's current state, and I can't help but wonder how the game got this far without this coming up as an issue.
However, I do understand this this is still not yet finished, and I will keep following the game in the hopes that this gets fixed in the future.