A mixed bag here.
Well, I went back and watched the other two parts after seeing this, and while I like the graphics, angles and animation of all three there isn't much of a storyline. If you plan on creating a fourth part you're going to have to explain what is happening. Furthermore, the ending of part two and the start of part three don't go together that well.
Asides from that, the one major thing I noticed was that Drügal had little to no facial expression.