I couldn't get the rewinding to work at all, and I found that zooming past all the enemies was a much better strategy anyway :/
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Thanks for your feedback! For rewinding, you need 10 limes. And for limes you need to hit enemies. Now I think that I should add a counter or something for counting how many limes you need to rewind. But actually I have already written "*// Requires 10 limes." on the game page. Anyways thank you a lot for your feed back again. I will add a counter asap.