very good game
Only two problems with it
It gets boring after a while since it's so short, and Endurance mode is just to easy.
And I found a horrible glitch. When you have to many robots on the screen the bullets they fire glitch and stop in midair, the robots then don't shoot anything else So the enemy robots can just stroll past without any problem whats so ever. I did figure out how to fix this glitch, I just had to scroll to the back of my base then back to the battlefield but it was so annoying, I practically had to play that game while watching my factories which was rather boring..
I suggest adding more levels, or a few more types of factories. Something else that would be cool to have would be a endurance mode that had no limits on the space you could build on, so you could build more and more factories. It would be harder than the normal endurance mode because the enemy could also keep on building. A lot more fun I would think.
Overall, despite the glitch and the repetitiveness of this game, I give it a 9/10, 5/5.