Nice work. Similar to another commenter, I originally thought I was supposed to kill all of my guys except one haha. The FX are incredibly juicy; the freeze-frame/camera shake upon picking up one of the blue orbs is very satisfying.
I also really like the core feedback loop if that makes sense. When you get hit, it's bad because you lost some of your guys, but it's also good because now you're more difficult to hit (you have fewer guys to manage). It's a nice dynamic-difficulty, where the game gets a little more manageable if you're struggling and get slaughtered early on. Great job!