For those who are struggling with the last level, you should just keep sending tanks and only tanks, because they don't set off mines. Oh, and use airstrikes on the enemy tanks and you'll win with ease.
The only problem I can see is the major lag... but that could be my internet connection, too. When the lag becomes unbearable, you can pause for a few seconds and the lag will get better for a short time.
Good advice, Baturinsky. Techno isn't that bad, guys. just bang your head on something to the beat - eventually you won't even hear the music anymore ; )
I don't know what everyone else is smokin, but I think the game is fairly balanced. I used archer towers the entire game and got past lvl 50 (at which point I was unfortunately bored out of my mind). Solid game with no lag or glitches, but just not very original. 3/5.