I just finished this last night so I'm still a little dizzy. Only An Alligator is similar to Aylett's Beerlight books and other works in the same way a safety pin is similar to a cannonball. Both are quite capable of puncturing the skin given the proper circumstances.
You will find the same odd linguistic gymnastic constructions, bizarre characters, unlikely and impossible plots, sub-plots, and sub-sub-plots. Aylett has full command of some of the strangest metaphors, similes, and general descriptors you will find anywhere in modern literature. (Is this literature? It is too artsy for pop culture so it must be so!) But Accomplice, the city/dimensional setting of Only An Alligator and presumably the other Accomplice books, is by far more surreal than even the strangest dark etheric alley corner of Beerlight. Floor lobsters, demons, wild cheetah pets, the pig servant/round one, a book about dogs, 800 eels, a political battle, and a savage kick in the family jewels are just a few of the threads woven into this odd little book.
If you are a fan of Aylett's other work, you will probably enjoy this as well. If you are new to Aylett, and are looking into dabbling into the weird proto-meta-fiction he creates, you should probably start with one of his more accessible works (i.e. Atom or The Crime Studio). Once you are familiar with Aylett's unconventional style, I'd invite you come back and swim in the deep end with Accomplice; but if you dive into this one unprepared you will probably drown before the end of the second chapter.