I stopped watching right after Snake knocked Popo off to the left and Nana off to the right. Why? Because Snake went after Popo, not Nana.
From watching for about a minute, the only advice I can give you is to know what to do when you land a grab. For example, do a forward smash then chaingrab anyway you can, repeat, etc. I noticed like the two times you landed a grab you had an epileptic seizure, meaning you just went crazy on the A-button and down on the analog stick. That will barely work against good Snakes because you need to rack up damage ASAP to kill him. If your way for racking up damage is. . . well, having seizures, then you're going to be demolished.
But then again, my input is completely worthless as I only watched about one minute.