Very cool style, incredibly neat concept, feels like an idea they'd actually go with in a proper 2D zelda game and I could see this becoming a full, very good thing eventually. The main issue is that it feels incredibly sluggish, especially when you have to push blocks for more than a few tiles, it gets incredibly frustrating. Also, the small paths you can walk across beside the pits should probably be a bit more clear, it took me a pretty long time to realize they weren't just decoration. Overall though, just shorten the sword animation, increase the movement speed, and maybe make it so blocks can't clip through walls when using the secret item, and you're onto a winner with this one.