I liked the graphics and the concept but it seemed like it was missing something and sometimes it didn't make sense how it played. I had difficulty understanding why some enemies could just walk right through my guys. Other times I just got tired of having to constantly click to spawn my guys which really slowed the game down because it can be difficult to be timely in fast forward mode.
I had no idea how the upgrades worked but once I found out, I realized I spent them all accidentally then on top of that the reset stats button didn't work. This really frustrated me and I didn't bother to play again after that.