I noticed the scaling problem too, if I'm honest - I developed it on a 4K screen, so no excuse for me not fixing it. Just fell through the cracks as the deadline loomed.
And yes, the shadows are useful! Only problem is that it requires the projectiles be opaque, which made styling them more difficult. By the way, did you notice that you can zoom in and out with the mouse wheel? Zooming all the way out gives you a top-down view that should hopefully make things easier. (Or does that not work with a Mac mouse?)