Some people complained that the camera was hard to control when the rotation speed was capped higher. It's hard to hit the sweet spot where it is neither sluggish or hard to control. As for inversion, we can definitely add an option to the settings. We're very likely going to change the camera entirely in future versions, the big problem is this camera is centered around the player; it creates a lot of problems for a 3D puzzle game with complex shapes.
We're also in the process of trying to fix the movement bugs.
Thank you for the detailed feedback, we appreciate it a lot!