The mazes were pretty well-designed, maybe some additional elements to the game? For the hearts: They did not seem to do anything, I'm not sure. Were those extra lives? I had 3 hearts the whole time and I was never able to pick one up.
Hey thanks! I was planning one extra stuff but ran out of time before the submission deadline. The hearts were your health if yous tayed on the lava too long you would lose one, and if lost them all the level restarts.