I played your game more than once. I think it was when the falling Tetris pieces suddenly moved much faster that broke my steady streak of row clearings. I lost with a score of 2033. The scales had tilted too much on one side.
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I think it was also because I had already come up with a mental note of how to prioritize the stacking of the blocks into rows and that I was steadily going with this plan when I learned that the game had ended. There was still the weight factor that I only really noticed when I was taking a screenshot.