Yeah try to never have black showing on the sides of the video, always have the video filling the whole frame, with the exception being letterboxed videos (you know, the videos with the "cinematic" black bars on the top and bottom). Besides that I would agree that it was a little long, intros should only be a few seconds cause you don't want to lose the viewer's interest. On a side not I recommend you upload a bit more often, your channel could use some more content to fill out that video tab