That's a funny and addictive game. I played several times and couldn't destroy those pesky good guys. By the way i only used the fire eye and cannon, couldn't start the shield don't know why.
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Thank you for playing!!! It is certainly very tricky to win - you have to be at the very least 31% health going into stage 10... even I have difficulty! Maybe the shield was bugging for you? I think sometimes after shooting the guns the shield might bug and you have to press S another time, but not sure.