-disclaimer: I have not managed to play this yet-
Style: 3/5. The text blocking is useful for reading the layout, and it's easy to read. The map could be more interesting, and a layout for the tower would be useful, as it seems more of a focal point than acres of burnt foliage.
Substance: 3/5. The creature is great, and there's plenty here to play with; I feel confident I could run the mission without having to tweak anything. I do wish there was more to interact with in the various locations, however.