Great concept, fighting an invincible immune system. Real like the screen shader. It felt like I am within the monitor. Great work with the audio as well. The beeping sound was a nice touch, really captured the feeling of being in a hospital unit.
I did have some confusion at the start of the game determining which units are the viruses and which are the immune system robots. I was franctically clicking every unit. But once I figured that out, it was a smooth sailing.
Excellent game overall!