Pretty cool concept. It made me think more about which blocks I wanted to use per loop, especially in the levels with a higher number of loops and the ones with layers (ie. multiple "floors"). I found some of the later stages a bit easier than their earlier ones so their order could be tweaked a bit. In one of the later levels, there was a platform you jumped up to from the loop door. I had to be careful not to walk back a loop trying to get onto that platform. Overall, it was an enjoyable experience. Great work!