The Moldorm beaten without taking damage. Played in real time on Snes9x v1.43 rerecording.
The key to this fight is that Moldorm will only travel in the same direction for so long. So if it's coming straight at you, as it often will, move away in the same direction until it turns and then let loose with a spin attack as its tail comes around into range. If it doesn't turn in time, release the spin attack to knock yourself away and avoid getting hit, but be careful not to knock yourself clear off the edge.
Once the Moldorm starts moving faster, stop using spin attacks. You move a bit slower while charged up and you need to be able to move fast in order to dodge.