It is actually doable. You just need to wait for them to come back down and then hop on them. I suggest hoping on every other one for the timing to get over in two up/down patterns. If you mean the second cloud level, you just need to get the gun first by wall jumping up the left as the Flag warned you ;).
 "Transformice"){kind=icon}
 "Slush Invaders Game"){kind=icon}
 "A Corny Platformer"){kind=icon}
 "Ceiling Cat Fishing"){kind=icon}
 "Thermo"){kind=icon}
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 "Idle Tree"){kind=icon}
It is actually doable. You just need to wait for them to come back down and then hop on them. I suggest hoping on every other one for the timing to get over in two up/down patterns. If you mean the second cloud level, you just need to get the gun first by wall jumping up the left as the Flag warned you ;).