Too easy. after getting trough easy levels you finally get to the point where it starts to be interesting and at that moment it ends. Seems almost like tutorial for game that is not there. Hopefully we will get so "chapter 2" where we can enjoy all puzzle elements to the fullest!
13074. second try :-)
After figuring out strategy aganist yellow tanks it becomes easy and boring. You should add few more stages (with harder enemies) or make more lvls. but still good game.