My girlfriend can play a better Snake, and she's never played smash for more than 10 minutes D: Never FF a Fair, place your Bairs much lower, you're not fighting DDD lol. Nice Nair > Dtilt, it can lead to a Fair chase sometimes, I'll assume you were aiming for that. You need some overall tweaking, atleast you tired to land the Bair, and you got him with a couple Fsmashes. But to be honest, that was the worst Snake I've ever seen.
Play me sometime, I'll let you fight my Zamus and Mario, I've even beaten a couple Sonic's as DK lol.
Edit: You have a habit of using Dsmash over Fsmash. Sure it hits on both sides, but Fsmash is quicker.