I'm a Tetris fan, and I'm very proud to say that this could be something here. The art, the music, and the concept are very good. I would have liked the game more if the scenario were the usual ten blocks space.
As soon as I started playing, I thought about how it would be very difficult to avoid the movements of a professional Tetris player. But maybe that would be a pain to make, so maybe playing around with different player movements could add some difficulty. For example, Tetris players that like to fill the whole screen with blocks and then clear the lines with back-to-back Tetrises leave you with little space to move and avoid the blocks, while players that like to make 4-line clears as fast as they can leave you with more space to move, but with less time to react to their fast movements.
Keep up the good work!