ELEVATOR REPAIRMAN, now kinda playable. Also rethemed a bit:
Changes: I stopped trying to develop the 1K and 4K versions simultaneously and am now using a table to change the background color, rather than manipulating the line counter and plugging that into COLUBK. Also created a sprite. Also cleaned up the display a bit, tweaked the left/right boundaries.
The main changes, though: a) the score, b) the timer, and c) collisions. It's all very rough, but now all of the essential pieces are there - well, except for a game-over condition.
As you can see, I haven't thought of anything better than the hotel maid theme; please throw theme suggestions at me! I like what I've got alright, but if there's something better I want to know about it!
EDIT: Small update before the weekend:
Just prettied up the text a little. Currently displaying about 200 visible lines, which is a bummer since I also wanted to have the title of the game and a small bitmap (~10 lines) above the play area, and ~215 visible lines is probably too many. Or is it?