Fixed version of the pre-alpha
After releasing the pre-alpha, I went to make a backup copy of the source code. Something happened and I ended up instead reverting to a slightly older copy of the source, resulting in losing some of the work I had done. A few weeks ago, I managed to go back and redo some of the work I had done, and a fixed version of the pre-alpha with fewer crash bugs can be downloaded here.
There are still some other issues, and currently only rooms on the first floor will work right, but it is a start. Hopefully in late August, I will release a version with working elevators and generally more stuff, but with a current full time job, progress has slowed down more than I had hoped. If I can no longer work on the project, I will release what I have.