Paging @retroshark here... wait, can you even page people on this?
I'd argue that since you can reduce a GB screen down to 128x128, it should still be allowed. Here's how you'd do it on real hardware:
- For reducing horizontally you'd use the GB window feature. Sure, you end up with something off-centre, but that's OK.
- For reducing vertically you'd use a scanline interrupt.
- In any case, if you aren't using a particular scroll direction, you typically don't need to reduce in that direction, you just need to limit the tiles used to that space and, in the case of horizontal, ensuring that the sprites don't cross past that, or applying some sprites to hide the transitions.
It would be much more respectful to the GB than some of the outright blasphemy that happened in GBJam4.