The game doesn't have, exactly, levels. It has a single map that as you get points eating food, you can open the next area. You do it until reaching the final area and eat the kings pizza (end game and it loops back to the beginning with higher difficulty).
The challenge is to beat 3x in a row without being caught by the guards.

Overall the game is quite short... The mechanism for replayability is that as you lose, you unlock extra power ups to help dodge guards.... I finished all challenges without unlocking all items, because it is not that hard.

I have to say I enjoyed it to play on the break from work. It's, overall, a fun short game.