Quite playable downloaded + fullscreened, apparently. Hm. Move the piece with the arrow keys; up rotates, left and right move, down moves down. Press the spacebar to "hard drop." There is also now a "piece shadow" feature, that shows where the piece will land. Still a work in progress... This is basically a port of a C# program that I made. Things to add: Next piece display. Score. Main menu/options. Difficulty levels. End of game.
