I was having fun with this one, but the music eventually stopped :(
I got stuck here because i couldn’t understand why the 4 was turning into a glitchy number 
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Ouch! I bet we forgot to loop the track. Sorry about that!
For the world 2 puzzle a 4 will turn into a glitch-number when pressed. This is not really explained but something that we hoped people would observe and learn to work with. The idea is to have puzzles where the space collapses slowly.
Thanks for the feedback and getting to world 2!