Sounds interesting! I'll say what I say about most Custom stories I've seen so far, though: Please, find a native speaker to help you with the english texts. It's always such a shame to see a good story and atmosphere get diminished by weird grammar and clunky translations.
(Don't worry, it's not that bad - I've seen much worse than yours, but still...there's room for improvement!)
Custom models look nice, too, seems like you suceeded with your lava, eh? And Blender monkey with fangs made me chuckle ^^ As for the screenshots, I don't know much about the editor, but would it be possible to increase the texture tiling on the big rock in the first screenshot? The texture resolution on it is far too low, especially compared to the ground. (which could use a little lower tiling in my opinion...)