VERY challenging game, however, the difficulty isn't meaningless, and it never gets to be overwhelming. Takes a lot of thinking and strategy, and its a beautiful twist on the tower defense (or should I say offense) genre. Exactly what a flash game should be. 5/5, wish I could go higher.
Definitely a fun game, but I'm not feeling the realistic-ness of it. The bullets fall outrageously quickly, and ricochet predictably with little power (they dont even really ricochet.) The bullet speed feels slow, and there's barely a difference between guns which like the M4 and the glock, where the difference should be huge. This could just be me though, and the game, in the end, is a great arcade shooter type of game. 4/5, not basing my rating on the claims made in the description.
Making your health the same thing as your experience, and then making it impossibly hard to dodge every shot shot at you from well outside of your screen was a terrific idea.