Oh! One more thing.
There are, in fact, counters for your ammo and your health in the top and bottom corners of the screen. However, when you enter full-screen, it appears the top and bottom of your screen become cut off, preventing you from seeing that important information. (Full-screen is currently the bane of my existence, since it doesn't seem to fit to the screen on your computer but does on mine.)
I may fool around with different placement for the ammo and health counters, but in the meantime the choices are guess what your ammo and health are or exit full-screen. :(