Trivially easy to sequence-break. You can get into the secret bar on Day One. You don't need to know who Greg is, and you don't need to have ever heard the codewords. You can get into the secret bar once a day, every day.
And the game is easy. As it is now, you don't even need to read—just reject if you see the color red. Perhaps you could add a hard mode that highlights everything the same color, so that the player needs to read the information to make sure it's right?