I liked the idea of the game; however, some points could be improved. The game required very precise movements, but the character was difficult to control. I felt like I missed a strategy to navigate those tighter areas. Adding to the difficulty, the player's body was ammo. You needed ammo to defend yourself but having ammo makes you harder to control. When you have a lot of segments you can see you surrounding better, which makes shooting detrimental. The more you shoot, the less you can see.
If you could make movement more manageable, it would greatly improve this game. Also, consider keeping the camera at a fixed zoom. Especially, if the player becomes more agile with fewer segments. Visibility is important with fast motion.
However, with that said, I think this game was nice. I managed to find the end. Also, controlling a flailing worm is quite fun. And the effect for adding segments had a nice punch to it.