Interesting game concept. One of my favorite game concepts is "popular game concept but with a twist". Whereas my game is sokoban with lasers, yours is snake with puzzles. It works surprisingly well. I liked how the level transitions are Zelda-style scroll, rather than just skipping to the next screen instantly.
I still don't understand the button puzzle on the fourth screen though, The number sequence didn't make sense to me and I just kept pressing buttons until it worked :)