FIT DAMMIT!!! LOL
Well, I really enjoyed it, and in case you haven't found out to this day, I believe what needed to be done was buy a seed on the way to zora river, then plant it as a child in a hole near the opening to the cave and water it. Turn back into an adult and there will be a nice plant there to step on that will transport you to the heart.
But I might be wrong :P.
Great job, you should stick to drawing, it looks great, and the sprites have tended to be marked lower lately.
I look forward to more of your work!!
~Gamer_Domeni