Wow. This is insanely fun. I must have played for like, an hour at the least and I still feel the urge to keep playing. I think you’ve got a winning idea here. I would love to see more mechanics. Some examples:
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Maybe some green arcs that appear one after the other in quick succession. Hitting all of them will grant a large score boost or restore a life.
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Purple arcs that will reverse the direction of the scanner.
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Orange arcs that have a “slot” that needs to be hit. Essentially, an arc that has a specific place where the mouse needs to be clicked.