Still at it. It occurred to me that the hearts on the left take 19 blocks to form.
Coincidentally, 19 is the total number of unique rotations of all the Tetris pieces, summed accordingly:
T – 4
S + Z – 2 each
J + L – 4 each
I – 2
O – 1
I wonder if there’s a solution that uses each rotation once AND avoids piece adjacency?