brilliant game
loved the game. graphics are good and the game is easy to understand but harder to master. the only thing is that there are too many levels - after level 3 i stopped playing. try adding more varied scenarios and a few different styles, maybe some lvls wher certain guns arent available, and some levels with new ones?
a hint to players - it is sometimes better to upgrade guns than buy new ones - and buying a laser turret instead of the plasma one is sometimes better - it costs less to upgrade to the same strength as the plasma one.