Beautiful game, and the sound effects really leave an impact.
The exploration and combat are really fun, but it started to fall apart when I got the Orb... certain platforms were really finicky to jump to, and the invincibility really isn't much of a benefit if something's shooting fireballs at you while you're trying to line up.
The boss was tough, and I'm not sure how well the attacks were telegraphed... though, I didn't really get much of a chance to figure it out. Every time I respawned against the boss, it took longer for the room to reload than the previous time, until eventually my browser told me that the page froze completely.
Still, a fun experience with a lot of potential!