Very nice and a good fit to the theme. The difficulty is definitely too high for me though, couldn't get past level 5.
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yeah i think i fell into the trap of thinking things were easier than they were because i had played them so many times! The trick for level five is to walk forward slightly (to get away from the hidden block), then watch the timer, full jump (hold space) just before 2 seconds, then walk back to where you started before the second flag gets you