Doomguy is transported to a very familiar island. However he doesn't have his arsenal of weapons and must avoid his way through the island.
Here is a demonstration of map 1, 2 and 3.
For a sense of progress.
Map 1 is probably 70% done. A lot of what is left is cleaning it up, adding a few more areas and getting the final polish done.
Map 2 is about 50% done. I want to let the player explore the caves to have multiple entrances.
Map 3 is about 30% done. This is the first 'inspired by' level. Which will feature the tank hangar as a familiar motif but the actual tank hangar may be appearing at a later date.