Done it, and hate to admit it, but playing now. It's even crappier than I remembered, but also soooo addictive!
From what I can see, the "upgrade" simply adds some "litter" to the battlefield - a few bricks, the odd bottle and other general rubbish. All in all rather disappointing.
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If it moves, shoot it, if not push it, if it still doesn't move, use explosives.
Nothing happens in isolation - it's called "the butterfly effect"
Mors ante pudorem
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