Yeah, I admit I had a lot of difficultly with it too. I didn't get far (but one day I'll get back to it, I swear), but I think I gathered that you should specialise your weapons to particular types of enemies. There seemed to be a huge (ultimately ridiculously unfair) penalty for not following this.
The plot was a little convoluted and poorly-translated (or something... poorly written?) too. There were things I liked about it too, but this isn't really for everyone, and I'm not sure who would actually like it, to be honest.
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