Nice implementation of the focus. Reminds me a little bit of the hookshot from Link to the Past (my favorite item in that game).
The swinging mechanic works well. Unfortunately, the controls are not always as responsive as they could be, and I had many falls that I thought should be avoidable.
The character sprite seems somewhat blurry; I wonder if you imported it with the wrong resolution.
The music is cool at the beginning, but gets repetitive pretty quickly.
Here's a bug: A couple of times, I fell into the lava but didn't die.