Thank you for the feedback.
I also was unsatisfied with the camera implementation, but I left it in to get feedback. The rotation is what lead to the aiming problem, as the aiming coordinates were originally based on a fixed angle camera, and then the issue was introduced when the rotation was added. The fix should be pretty easy as you said, but I didn't discover this until late into the project, so I wasn't able to fix it before release
I also have some ideas for larger levels, and actually designing the layout of the levels is something that can be done very quickly, but I wanted to have a more robust camera system in place before doing that