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Bug report. I fnished the first level. Before the second level started, I bought Shield 2. I then clicked outside of the browser to deal with an IM conversation. When I clicked back, the robot was invisible which made it impossible to dodge effectively. He was still there and reacting, running, shooting and everything, but the graphic was gone.
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This is incredible. Only suggestion/request would be not needing to keep clicking to shoot. It would be nice to be able to just hold down the button. Animation and design is fantastic though. Great work! :)