Frantic!
Yeah, I enjoyed it. There's not much to it, which is why you don't get a higher score, but the fast-paced action made me play for a while. Maybe give the player a few more seconds to react at the beginning; my character died before I even realised what was going on.
It's a good enough game though, music was nice, graphics were passable and I LOVED the fact that you could still stay alive on the debris following the lava, it was a brilliant touch.
Add a bit more to it - some more challenges, some different parts (bonuses, levels, etc), and this could be great.