Good Game... but...
The "Ol Glory" totally did not live up to it's name. I usually like buying the biggest baddest gun that will "ruin the fun" before buying so many autonomous gunners and repairers. When you don't have to touch your base anymore, while still staying alive, is when the game is no longer fun. After saving up for ol glory, I was very letdown when I found I could unload an entire clip into a tank without it blowing up... 400k for a gun that can't take out a tank in one clip? The first level I had the gun, I died... The alien gun was actually more effective, as it was not only an area of effect weapon, but also killed things (including tanks) in one well placed hit, not to mention the reload cooldown was drastically shorter.
All in all, I guess the only way to "win" is to build the autonomous base that all these defense games usually allow... Not much of a game after a certain point, but whatev. A good time waster.