Very nice. Love the amount of levels and the overall idea is great.
The only that annoyed me a bit is the sound when you hold the mouse button, and you are like me and start holding it at the worst time possible and you have to wait until the long snake passes, the sound it made did get on my nerves a bit. Honestly not sure what to do about that.
But overall I liked it. Not the most challenging of puzzles but a wonderful idea nonetheless :)