The hit detection for your sword is terrible when you attack horizontally (right to left). Most of the time you'll miss even though the sword is clearly going through the Octorock or bush.
It's only reliable when Link is facing in a vertical direction.
Also Link's movement needs to be smoother--right now it's a little too herky-jerky. The responsiveness of the controls is pretty good though.
Except for the shield: there were a few times I raised it just before the Octorock's attack reached Link, and he still took the hit. The shield did always work though when I raised it well before the attack reached Link.
And the font in the message boxes doesn't seem very Zelda-ish (actually reminded me of Breath of Fire a bit).
I can't get too far into the game because of the problems with the sword and shield that I've mentioned.
Also this:
Pick an art style and stick with it, why do you use a Minish Cap Link if everything else is from GBC Zelda games?