Snake has no very fast aerial move, so ORLy knows his stuff. I find it very easy to get a 50-60% combo on snake at the very start of each of Snake's lives. Just vary attacks between uair fair zair and upb, depending on his position. Mostly uair and upb though. Found that most effective. If he is edgeguarding, throw a few missles his way before tether recovering to a quick edge attack, or if at higher percentages or just to mess with him, drop off the edge then quickly come back on with fair straight into upb as soon as you hit the ground. Make sure fair is very close to the ground, or this wont work. And remember about what cancels what with Snakes projectiles. Grenades cancel all of Samus' projectiles, but homing missles and an uncharged shot will not blow the grenade up. Use that to your advantage to keep Snake's grenades near him. And Snake's forward-b gets knocked off course by almost all of Samus' attacks except the near-fully charged shot. That destroys it. It is much better to knock that off course, especially during it's early stage, near Snake. Then you can zair both of them. And watch out for hit ftilt and jab combos. both cancel missles, so if you trick him to staying in place trying to cancel missles with his jab, very quickly launch off a Homing followed by a Super Missle followed by a fully charged shot. Or if he is jabbing, you can get a super missle to his face and not his fist if you short hop right. And if you are stuck in close to his jab combo or ftilt, then shield, and hope that you can counter attack with a jab then dtilt, because even those for snake are killing moves against Samus.