The graphic package needs to be taken in the context of its time. This was originally a Game Boy game from 1989 after all, so you probably already know what to expect (if not, make sure your expectations are modest) At least the visuals don't blur on the 3DS. The lengthy table has a solid amount of targets and the like to keep you occupied, and the animations (though sparse and simple) are appreciated in lieu of a static playfield. And of course, the gators are just plain fun!
On the audio end, there are a few music tracks. They're all pleasant, and compare favorably with thebest of Game Boy music during those early days. Considering many GB games had only one music track (or played in silence) Gator's varied selections are a real treat. I like the tunes, and think they complement the action well. No need to mute this one.
Revenge of the Gator simply plays well. The physics were quite good for the time, and it felt like you truly had control with aiming and such. It's targets are nicely varied, and when you factor in a number of different bonus sections, the table is a very good size. It's the sort of game that can easily eat up more time than you expected, as you'll want to try one more game to best your high score(s).
Speaking of which, even though you play for a high score (as is the case with nearly every pinball game) the score will reset every time you turn the game off. The original GB cart lacked battery backup, and this is straight VC emulation with no save added. However, if you can remember to create a restore point between games your scores will carry over.