Firetrack has always occupied a place in my free time back when I still played calculator games on a regular basis, and I recommend it for download to anyone. It is one of the best arcade shoot-em-up type game I've seen so far on the TI-83+.
Graphics- 10/10 superb. Ships moving fast make them a bit hard to see on the non SE calcs though, as they have a low momentum/motion blur speed
Gameplay- 10/10 awesome gameplay, nothing negative to say about it
Controls- 10/10 Controls are very well chosen, and you would be able to play it even without reading the readme!
Replay value- 9/10 no level editor so you will end up replaying the same levels if you restart playing again. Still have enough replay value though.
Overall- 9.75/10 you should download this.