I just played your game. Big fan of Zelda but also a big fan of Binding of Isaac, so I really liked this game. There are some things I would have changed, for example, the velocity of the player (although it was nice to have the power-up that allows the player to do the "link" movement and move fast). Also, it's really hard! (something that my game has, too). But I guess that's where the GB soul comes from.
Nice entry! Hopefully, you play mine, I'd like to hear about your feedback!