Grey Goo Turbo Challenge
This game is from the old Ludum Dare platform. You can try viewing the original page on Web Archive
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Arrow keys or WASD. Scientists were meddling with self-replicating nanobots when things got our of control and a huge rolling grey goo scenario escaped to the main road. They have tried to put a stop to it by spreading red sticky nanogoo all over the road, but due to a bug in the nanocode some of it has turned into beneficial (or is it) green goo instead.