If you find something off or doesn't work as expected, feel free to post your questions or concerns in the Adafruit Forums.
If everything works as expected, feel free to move onto the final steps!
Now is a good time to check all of your work. Are all of the wires connected? Are all the components secured? If you find some of the wires are too long, it's fine to trim them short.
Congratulations! You've finished building the PiGRRL Zero! Take a moment to test out all of the button acutators with a play test. If eveything works as expect, great! If not, please feel free to post any questions or concerns in the Adafruit Forums.