The game play was good
The game play was flawless, it was a perfect snake game. However that's one of the downfalls with the game in my opinion, it's exactly the same as many other snake games out there.
If you want to make it unique or interesting how about making a plot or story as to why Master Chief has turned into a snake thing that has to collect (whatever those things were) in order to grow.
Also the background was stale, and uninteresting. Maybe if you had levels with different background, I don't know it was just a very unusual idea mixing Halo with Snake...
I'm not saying that by being unusual it was original. It was like you said, "I like the game snake, and I like the game Halo, and i've got the action script for snake, so why not put them together?
Basically the point of this review is that your submission had no point. You have the gameplay down pact, why not make a plot or something and make it interesting for the player.
Hope this helps, sorry if I was a bit harsh.