Cliffski's game of tank (and mech!) battles now has a demo, as per his strict policy of producing a demo for every game he puts out. You can pick it up from the game's own site, or from the GTB page on Steam. The demo contains a sample of the game's two-way tower defence action, where you can choose to build the defences, or to drop waves of soldiers and armour into the trenches of an alternate World War I. It's worth playing the demo, because this one's not for everyone, as Tim's verdict concluded.