I've wondered about this quite a bit. From the perspective of an old school, 8 color game, I would totally agree. My resolution for the camera is 64x64, so technically anything that I can fit into that space is within the dimensional requirement. And by that I mean that I would think that the smallest unit would be a single pixel, relative to that 64x64 camera resolution. It probably doesn't work out like that in practice.
Alas, I am not certain. And I am certain that I am not trying to argue, just expressing a question I have aloud.
And, thank you for thinking it has the makings of something good. Thankfully, the mortal coil of a game doesn't end with the jam.