No reason, just busy. I'm finishing a new game this week, so after that's done I can tie up a few loose ends before going back to Robotron.
Okay, understand.
By the way, because i read that you asked for suggestions and i also saw, that you already have made some good Atari-2600 ports. A 1-to-1 port of the Atari-2600 version of Phoenix would be absolutely superb to have on the C64. I totally love Phoenix and especially the Atari-2600 version, although i know, that this version is a bit different from the Arcade original. But i actually like the Atari-2600 Phoenix version the best. Nothing would have to be changed, it could be ported 1-to-1, no improvements needed, this version is ideal as it is.
I know that you have alot work at the moment, but this would be a suggestion for future projects.