I would strongly recommend allowing players to toggle the camera x and y axis inversions on and off, the default setting was very non intuitive for me and it made it difficult to play the game since moving the camera is a critical part of the experience. It may also be beneficial to allow the camera to snap into positions at 90 and 45 degree angles across the map

I'll add mouse options to the next build.  I'll try playing around with angle snapping.

My advice: allow switching between camera-mode and aiming-mode.

the 4-directions-of-firing we currently have has a tendency to put us in positions where we need to aim using a majorly obscuring angle,
meaning we can't tell wether we have hit our target or not.

Have you been using the lock-on?  That's the intended main method of aiming.