Hey, thanks for the feedback!
Walls crumbling when there are not enough surrounding walls is something I had not yet gotten to as of the last update. I have since implemented this, so you'll see it in the next update, which should be released very soon I appreciate the diagrams though, they really helped me to recall the functionality of walls in the original game.
As for buildings, the game does support buildings, however there is not currently much of a UI. this is the biggest point that I am focusing on right now, as in the next update I would like any implemented functionality to be able to be used by the player in a way that is familiar to the original game, as opposed to the current, very basic system of left clicking tasks to set them to high-priority (aka. to be performed by the next free raider).
Finally, with regards to levels, the other test level is not particularly interesting, but the level file converter that I am writing will be included with the rest of the project in future uploads, so you can convert or modify your own level files at any time, although of course not all level functionality will work properly as the project is still in development.
On a separate note, I recently have run into a question that I would like to pose to the forum, as it has left me a bit stumped. in the first level, the very starting area before any drilling looks like this
However, I cannot seem to figure out why the dirt wall in the left-center part of the screen exists. According to the terrain map for level 1 (Surf_01.map) The map should actually look like this
As you can see, according to the map file, the relevant section of wall should be:
4 3 1
5 5 3
but in the game it appears to be:
4 3 1
4 5 3
where 4 is dirt, 3 is loose rock, 1 is solid rock, and 5 is ground
If anyone has any idea where this dirt wall may be coming from, please let me know, as whatever the reason may be it should be added to my remake in order to maintain consistency