Very good game, and great progress on it. I would like to see a kill all button though and you might only regain half of the souls or something like that. This is because when I leveled life up to 2000 and spawned max people it took forever for them all to die. I think I had to turn off the game before they did, and I lost all the souls and levels they had.
Just to let all you "plus this comment so the developers will see" people know, the developers have their own email, website, and twitter, so they don't check the kongregate comments. If you want the developers to put something in the game, send a polite email to them suggesting so.
Good game.It could use a minimap for overall veiw of map along with click to go screen control. It needs a retreat button on tanks, better tank selection method, and more variety of upgrades