Emmm...
I experienced a glitch where one of the infantry(Last level, on the opposite team) got stuck behind my turrets, where I was unable to reach him while he was constantly hitting my base so that I eventually lost. I believe this occured right after I pressed the button for the lazor beam. You might want to look into it if you get any more complaints.
Other than that - excellent game - you have perfected the previous version - good job.
Cheers