Thanks for the response! So, then, that is indeed a 17Hz game; but that sounds like the realistic option since you wanted to include as much content possible from the arcade. Still, good job on keeping everything tied to constant frame-rate and animation pacing. I personally am no fan of random-ish slow-downs or speed-ups either; or inconsistent animations.
I admit I regretfully didnt pay the needed attention (despite the coder had pointed it out) to how things moved faster in X (because of double-pixel resolution, heh) in one of my own games and am actually quite surprised by how not so many people noticed that!
Anyway, what is interesting is to get some insight on how going the cartridge way has assisted in making the game the way you did. What otherwise impossible hazards has it helped overcome. For example, would making the game for disk just mean that you'd have to 'split' it in three separately loading levels and that's it, or is there even more data being streamed while the game is running?