Its awesome, also its not about if its already been made but the fact he created it from scratch and everything you see there is from his mind and no one elses.
Bet it was hard to code. What program uses Ruby Coding might I ask?
I saw the word Tetris and I immediately clicked the thread.
Seems really re-done with smoother graphics and all.
Can't wait to see a 2 player version if you plan on making it. (ie. P1: Arrow Keys, P2: WASD.)