This is a really good idea, and you are right its not hard to implement! it does mean that we wont have the dancing colours on each beat though, i will have to try to see if it looks good. Thank you for the suggestion!
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We've implemented it in the full version of the game! Here's a preview: https://twitter.com/7thbeat/status/1088142654863372289. The full game will be out here in about a day now. Thank you for the idea!