The themes don't really bother, so here's my unbiased analysis:
The graphics are great and the style used is very charming. I think it would look even better with more detailed backgrounds. The music fits the ambience nicely, and the one at the end is reaaally good. The overall presentation was nice, the game felt pretty polished.
The gameplay, however, is not very interesting. The characters don't react as you shoot them, so It was neither fun nor disturbing. It didn't help that we don't know the character's motivation, or anything about any of the characters , so there is no emotional connection. The "devil" lines were also pretty cheesy.