Haha, well, I'm no pro, but I think I'm pretty good at Link, so I'll try to give you a nice critique.
I honestly think what it boiled down to was I got the first stock on you. The moving platform saved me on a poorly DI'd Fsmash (which you kept fresh, which was good) at 110ish, and I somehow managed to squeak in a ftilt to kill you. The second stock then cinched it. You were trying to get a kill move on me most of the time, whereas all I had to do to really assure the win was pepper you with damage and punish any of your missed killing moves. It's understandable since it gets very frustrating to see an opponent still running around at 199%, but honestly I think that's when it's BEST to be patient and play defensively and wait for an opening; your opponent will be looking for the big hit; so they'll be looking for that, not a quick attack to set up into a killer.