Thank you for the suggestions, I think they would make for a pretty interesting game outside of the jam. Also you should be able to keep rotating the camera past 15° even with the mouse on the edge so the limit wasn’t intended. Thanks for playing!
I think it was due to the Mouse not being stuck to the centre of the screen. When the user attempted to move the mouse, the Physical Curser was moved as-well. When the Curser then reached the edge of the screen, it was unable to continue any further. ♥