Hey thanks for all that. I think playing for writing will make those other scenarios more interesting; I just found, when I tried, that I couldn't be bothered investing enough time in figuring it all out. Plus all of their optional "planks" and such meant that I spent more time looking up where I needed to save branching games, and less just getting on with it. The price of non-linearity.
Also great to have a list of levels you want! I don't even remember Pinky and The Brain references, so that's something to look forward to! The dark level you mention; maybe Ameseno Italy? It's dark and has storms going on. A classic TI puzzler as far as progression goes. Really looking forward to some of those Earth levels now!
Re others doing writeups ... well I suggest everyone post here if they want and which levels they want :).