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There is an easy way to defeat the dragon.

If you get too close to the dragon then he will raise his head and it
will be difficult to hit him.  If you are standing too far away from
him, then he'll fry you with his fire breath.  Move away from the
dragon and stop at the point where he lowers his head.  Turn around
and you should be able hit the dragon with the overhead chop (pressing
up and the fire-button).  If you don't hit him, then you are standing
too far away.  Just try to move a little closer.  When you have found
the right distance then you'll only have to move up or down to dodge
his firebreath.  It's best to stay at the top or bottom of the screen
and wait until he is nearly at your level.  Now do one overhead chop
and dodge the following breath attack by running to the other end of
the screen.  Repeat this until the dragon is slain.