I love the Necromancy theme. Just as others suggested, In a future game it would be nice to see some kind of visual change to whats going on. It would add a great value to the game.
Really nice game, the only thing I miss from the first is the story, where every level you would get some funny dialogue. I mean, it was a nice touch. But it is a good game anyways, the gameplay is solid.
It feels like a monkey would feel in a scientific lab. You can do the tests, but you can't understand why they are making them or how. You only know that at the end you will get a banana as a reward.