This is fantastic. Great music, love the art, the writing is funny. I love the different sounds the creatures make when they get thrown in lava. I think it's really funny that they can be thrown in lava. Your theme interpretation is excellent. The mechanics are simple in a good way and so fun.
I think this is already very polished, I am super impressed. If you wanted to add more, maybe some sort of score counter or leaderboard could be cool. Also, there's a typo with ogres in the dialogue of the third level.
Great work all around.