Wow, thank you! I'm happy you enjoyed it so much! Yes I also 100% wanted to add one in but it was quite difficult for me to learn how to implement it at the time. It'll definitely be in if I make a full version!
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One thing you could do that is potentially easier than rewinding a set amount of time is to rewind to the last time you grabbed a heart or died. Every time you die or grab a heart, you can save the positions and states of all of the ghosts, boxes, etc. The rewind goes back to the previous state. Just a thought. Hope it helps!