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Even with a 5v LED and a 5v output, it's still good practice to add a current limiting resistor, even if just a few ohms. You would be surprised at the current that can flow from just a small tolerance in voltage.
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Did you not use a resistor to limit the current in the LED? Without one it will quickly burn out. A blue LED will typically have a forward voltage of 3-3.4V and current rating of 30mA. You would need 190ohms of resistance to safely operate the LED and the closest normal resistor to that is 220ohms. They are pennies, and will save you buying more LEDs when this one burns out. Nice looking project though!
Note my calculation is based on a 9V battery
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