What a few others see as a failure, I adore with this game - each "level" remains the same difficulty, rather than getting increasingly difficult. This means that anytime I have 5 minutes to kill, I can pick up Noodles and play 10 interesting, complex games, without reaching that point where I spend 2 days on a single game.
They are never easy, there are hundreds and hundreds of games per level, and levels of increasing complexity which are open to you right from the start.
Could not possibly be happier with this game. Thanks, Starbucks! Hopelessly addicted.