The trick is, once you get to the bottom-left area of level 3, is to block the goblin while moving forward (left) and at the same time, jumping up and placing another block so that the fire breathing dragon moves to the right then quickly moving and jumping back to the right (on stone block) to avoid death and repeating this again a few times.
Eventually, while you're standing on the stone bit, the dragon will move towards you and you'll be able to remove the block it's on, killing the bast. From here, place blocks above the goblin to get to middle-left area....
... and by then I'm out of time. Again and again and again LOL.
I'm determined though!