The controls are standard for a TI-89 game, which is troublesome on the Voyage 200. The arrow keys move the cursor, and the 2nd key rotates the current piece. The problem with the V200 is that between 2nd and the arrow keys is the escape key, which quits the game with no confirmation. I found myself repeatedly exiting accidentally. Also, keyboard bounce is not controlled, leading to double keypresses very often. (Which, in turn, lowers your score meaninglessly.)
The graphics, while not gaudy, are well-executed, with no dropped pixels or other detritus.
Gameplay and Replayability: 10/10
This is where nyetwork really shines. The game is engaging enough that it almost made me miss my bus stop the first time I played it. It's infinitely replayable because each game is randomly generated. (Sticklers would argue that 10^70 different games isn't infinite, but who's counting?)