I've finally played this now and it's great! Very good, innovative use of some well-known tilesets. (The Cave and the Machine, and the odd transparent one whose name I can't remember - the caves you built from either have little in common with the look most people go for with these sets. Especially loved the 'columns' whose capitals were made from the corner pieces of the Cave and the Machine tileset.)
The music seemed a bit incongruous with the creepy atmosphere of the blood-red world, though.
Still... lovely environmental; enjoyed it very much.