Actually it does get faster, just not as quickly as you'd like
And when you miss a move, I assume you're talking about the combos, your multiplier goes back to 1, so in the end of the combo you get less points then you would had you not missed, unless of course your multiplier is already 1.. then you need all the help you can get.
Yeah, I haven't submitted it yet, so now I can add aaalll sorts of crap.
Edit: Well I blew that one... read the new deadline for submission wrong... POOPS
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