Reverse Psychology
So, we're supposed to avoid the metals, and seek the plasma grenades? That doesn't seem a bit backwards to you?
Anyway, the worm controls about as well as a worm should, and the soundtrack, while enjoyable, is of rather low quality.
While the obstacles are a nice touch, the only way to make a snake game better is by finding a way to innovate the genre itself, while still staying true to the halo theme. If your satisfied for being another generic snake game with Halo on it, no need.