Great grade of increasing difficulty and good "edutainment" game. I think that many will be tricked into not realizing this is actually a learning game, but I think that it's most effective application would be in a classroom. It is timely enough for Halloween, and any savvy science or math teacher should try it with their class.
gfx - 7 (workable, but not great)
sfx - 9.5 (cool song, reminds me of Dawn of the Dead)
design - 8 (solid, but nothing we haven't seen already)
gameplay - 8.5 (very good, made me want to keep playing)
overall, this is a good game where the objects have a good weight to them and the addition of a rotation buttons makes for more dynamic gameplay.