This is by far the best Tetris Remix I've heard. I've heard quite a few, and even made one or two.
I really like how you kept the main line but also managed to add a new sync and kept it even enough to still make out the original.
VERY good, I must say. I really can't think of anything that could make this better.
Except maybe some heavier bass, but that would throw it off a little.