I think he mentioned something about safeRAM conflicts, such as his game using the same RAM areas as Fullrene. I don't know if Runprgm or Pageswap would have similar problems.
I could finish the project today if I needed to. It wouldn't have any real challenges though. Most of the units are finished, but there aren't any enemies. (you do run out of air though)
I may end content there and work on debugging, adding the last levels and rewriting the whole thing in assembler as a multi-page app.
What do you think?
I guess if all else fails you could turn the game into a puzzle strategy like this.