Although I usually am disapointed by Basic games, this one turned out to be much better than I expected.
This game has much better graphics than I realized was possible with Basic programming. All the stationary objects are unique pictures, and the opening menu looks cool. The only problem with the graphics is that enemies and the theta character flicker, and are all letters or symbols.
On my TI-84 the gameplay is usually quick and interesting. Loading levels takes a bit longer than I would like, but it's not a major delay. Also, whenever Theta touches a special platform, or picks up something, the game temporarily slows down considerably.
Some of the levels are set up in a normally impossible fashion, and others get pretty close to impossible. I found myself being forced to use the cheat code more than I would have liked. Also, there are only so many types of levels, and some get a bit repetitive.
The game is very user-friendly, with intuitive controls and lots of features. It's fairly small, memory-wise on a TI-84, although it is stored in RAM.
A surprisingly good game in Basic, although it isn't perfect. I recommend downloading it and trying it out for a while.