It's a great first effort at flying and editing. Since this is for your memory box the length isn't critical. As you shoot and edit more videos try to keep each video clip about 5-10 seconds and piece lots of different shot together. That makes the video move more quickly and holds interest. The best videos are around 2 minutes max.
When using the steady cam it will give you smoother results if you use a golf cart of bicycle. That removes the up and down motion from walking.
In any case, nice work.