Wonderful game. I love the art. With many of the differences being able to be passed off as style differences, the two images just seamlessly run together. The hard mode is worth it if you enjoy the art.
I enjoyed murdering the population of the world... then destroying it... and earning all of the badges. Granted, the first three were within like, 3 hours, but the Species Extinction took another three. (Slambomb, slambomb, heal turned out to be the magical combo for killing kings and subjects.)
I didn't feel very pressed for the campaign mode, the heal spell being limitless made that the obvious choice for first skill to go up to level 5. After that, I didn't die... at all. First time I experienced defeat was in Darwin mode.