I stumbled across this forum today and was surprised to run across this. Sorry PeBo, I intended to add high scores, level editing and even some robots roaming around but never got it all finished.
I originally wrote Spacestation Pheta in Extended Basic (well, there was an awfully slow TI Basic version IIRC) and then did a Mini Memory assembly edition once I got one of those. I had all the level data contained in a BASIC program which passed it to the actual game in assembly, the 4K of RAM didn't have enough room for both. I was in high school at the time and didn't have a PEB and disk drive to be able to do the level and score saves.
I later did get the PEB and the Editor/Assembler package and was able to combine the levels and the game into one package with the additional RAM but didn't add any additional features that I recall. The E/A version may have had a few more levels since there was more memory to work with, I can't remember. I think there were 40 of them total. I did write some sort of level editor later, but the original ones were all done on graph paper, many of them during high school classes. :-)
College, women and work started consuming all my time and energy and, alas, I never completed my grand vision.
Jeff Bunting