It can be fun to be the bad guy, lol.
Having finally played through all the difficulty levels, I still like this game just as much as when I first wrote this review. :) After learning all the ways to upgrade (some of which were hard to learn since I don't know the language) the later levels never got too difficult; they were possibly a tiny bit on the easy side. If I try to go really deep in the bonus dungeon I'm sure that will get very difficult like it should. But all in all this game has provided a really good playing experience for me, which I tend to play into again fresh on every mobile device I use. This is one of my favorite mobile games.