As much as I like the concept, there's a whole bunch of stuff that doesn't come together too well. Perhaps Castle tiles could go better with Tubelectric tiles were it not for the completely different depth of shading they got in the process of palette change... But those fans on the ground just look weird pasted in like that, they need some sort of support to stand on, or at least shading beneath them. Furthermore, the color of these fans, and also pipes and tubes, doesn't go with the rest at all. Try to make it more consistent with the WTF fans. Those trees could also use some desaturation on their greens.

Also, I'm hoping you're going to do something with that glass pane to make it more... glassy.