An update I suppose. The first two screenshots are from a largely unfinished map, the rest are from the first map. The screenshots don't reveal much, but at least are something to look at. Brightness/contrast might be a bit off, as I had to adjust it to seem bright enough on this dark monitor.
[spoiler]First, a nice, clear, blue lake. Yep, nothing special about it (well, it seems that way in the image).
Next we have a beach on the cliff-like area of the island. It's a remake of the beach in the first .wad where you find the blue key.
A cave with an alter of some sort.
Another cave which has some importance depending on which path you take.
Just an ordinary set of mushrooms and an ordinary stump with an axe in it.
Small ruin on a small island.
Ruins on the beach, complete with alter & candles.
Another set of old ruins, mysterious as always.

[/spoiler]
Progress wise, I can see an end (but doesn't mean it's near finished). I have most of the maps finished (there'll be 6), just needs details. The puzzles/paths are mostly complete for about 4 of the maps. A current playthrough time takes about 45 minutes with me knowing exactly where to go (getting lost is hopefully part of the charm). The main thing that's slowing me down right now is ideas for monsters. Currently, not one single object is a standard object, all are decorate objects done by myself. Since I'm not trying to make it like doom, I don't see any point in using the stock doom monsters. Doesn't mean there won't be doom monsters, just not as you are used to them (since part of this mod is about individual battles, whether it's with a monster, or with the island itself).