Puzzle #109 - Tetromino Tower (Masyu)

Another day, another Masyu puzzle. As my entry for Logic Showcase 12, all pearls had to come in groups of 4 or 5. Originally, I tried making a puzzle from just the 12 pentominos once each, but had no success in finding a good arrangement. Then I tried a 10x10 with just S tetrominos with similar failings, but that puzzle turned into this once I added some other pieces and enlarged the grid. Unfortunately symmetry still broke and I couldn't fix it, but this puzzle has a very nice flow to it and placed 6th of 13.

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