I think a darker exposure might have brought out more of the marvelous light and color in the picture. You could loose most of the details in the dark spots without loosing your sense of the subject, and yo'd see more details in the light spots. Tighten up the composition a bit by cropping.
Technical: Fits the challenge. Exposure is tough with neon- you're a little underdone on the room itself and a little hot on the machines and the neon. I like the composition. Not sure where the focus is. Lighting is so so.
Personal: Not overly creative. I'm surprised by the lack of people! Some "ghosts" in the extended exposure might have made this more interesting.
A difficult picture to have taken - I didn't realise that casinos allowed photographs. Basically you have an exposure problem. It is too dark and the areas that are lit are soft - hand held shot at too long an exposure? The picture is really the right half of the image.