Just a quick note to let everyone know the status of Vector Tanks. I've had a lot of personal challenges over the past few months that have kept me from devoting much time to Vector Tanks, but I have been (slowly and painfully) adding new features. I currently have 2 different types of enemy tanks in the game now - the new tank has a functional rotating turret and can drive over the playfield obstacles, crushing them. Additionally multiple tanks attack at the same time now.
Here's an image of the new (turreted) tank design, called the "Heavy Sixer".
I've also been adding and tweaking the program here and there in various ways. Work has begun on a global leaderboard system that includes chatrooms, but I'm not sure that's going to make the next release.
I'm hoping to be able to wrap up this version soon and get it submitted to the App Store. I realize it's been a long time since the last update and I am sorry.