I've just noticed that, back in the day, Mean Machines reviewed this game using a proto version, with some of the missing bosses operational and other stuff not seen in the final.
Go here and click on "download review" to see the pics. Note how they even explain how the lost ice magic works, and complain about some backgrounds that never made it into the final product and can't be seen in any of the protos available (take a look at the flying boss pic, and that "airship level").
How I wish somebody that still had this proto.