Ok im new to smashboards but not to kirby, anyways, snake has id say 5 things i know he will do
-pull a grenade, then shield roll when you come at him, your attack will blow up the grenade but not him
-Mortar then ftilt, this assures you cant roll away from him
-a,a,a combo
-C4 grab you throw you into it the detonate
-edgeguard with martars, Nair, or Fair
all these are beatable and my key is lagsless aerials,
not many people know but a fall falled Nair auto cancels while a non fast falled doesnt, if he shields the Nair grab him before his tilts or a a a, if not follow up with kirby's a a a vulcan jabs, when he does the mortar f tilt run backward short hop away then back air when close, chances are he will finish his tilts and be vulnerable, never dash attack if you hear his grenades and steal his grenadess they will help so he cant camp. jump off the edge inhale him then spit him under the FD lip, if he UPb and isnt caught under Bair him into a stage spike. other than that i suggest alot of Fsmashes because of range issues
good luck
on a side note, attack from the air