well
It was ok. I have one thing to say to start this review off with, and that is the description says "nobody must leave the quarantine zone!". To me that just sounds weird and for some reason is annoying the crap out of me. Secondly, if you do have a quarantine zone it is a zone and zones are usually square. and have the same defenses on all four sides. Now that we are past that I personally think it takes to long to get a single upgrade. Honestly, 750exp for one upgrade is ridiculous when you aren't getting an eigth of that in a single wave. Furthermore, the game really needs some balance and tuning. When you are shooting the reticule just gets too big. So to wrap this up, i say it was difficult and really just needed some adjustments and such. If you do all that i don't see how this game could be anything but spectacular.