Skull fortress - environment explorations

I went back defining some of the environment I sketched moths ago while I was doing the "Pandemonium" remake studies (again, just for fun and self exercise, I'm not related with any project in the works by the original creators).

In this case, the very first level of the game, Skull Fortress; I imagined being tasked to develope a visual reference for the environment of the hypotetical remake, in a way that it would be coherent with the cast of characters done previously.
I remember, when I was a kid, having so much fun bouncing on the watermelons.