Cool game. I also did a reverse-snake style game, so clearly great minds think alike, eh? :)
Are there levels after the third? I got to about 30 points, then my pellet didn't spawn in and the snake ran itself into a wall. I didn't realize at first that the goal was to feed the pellet to the snake, I was running away instead for awhile and wondering why my score wasn't increasing on the first level. That could be explained in the description maybe. It'd also be nice if I could hold WASD to move instead of having to press it. It gets a bit tiring spamming the keys.
I spawned in a wall once too, but it let me out thankfully.
I like the minimalistic graphics a lot, super clean. Nice work!