NOT Tetris
You simply should not compare this game to tetris. In tetris, you are able to see the block that's coming up, allowing you to plan ahead, while here you just have to hope to get lucky. In addition, there is absolutely no music or a background, both of which would have made the game interesting, and were present in the original tetris. To make matters even worse, the blocks fall much faster than they do in normal tetris, and here you have no option to slow them down.
I believe that you have programming skill. Utilize better next time.