After adding this little piece of code, you can now play the game as intended on any monitor, even without rotating the resolution.

if(Camera.main.aspect > 10f / 16f){
            float aspectScale = ((10f / 16f)/Camera.main.aspect);
            Camera.main.rect = new Rect ((1-aspectScale)/2, 0, aspectScale, 1);
        }

The game now also supports any controller configuration you can think of from the in-game options screen. Also in the Android version.

Lastly, I upped the general ammo count for all weapons.