Comment by zugi

Nice but keep in mind that 5x5 font just punted on lower case letters entirely. So there are no descenders and they use the full 5x5 for upper case.

The 4x4 font has lower case, so it reserves the bottom row for descenders gjpqy. Its upper case letters don't use the descenders row so they're really 3x3, which is barely readable. It's actually interesting that the all caps 3x3 is almost readable!

For comparison it would be interesting to see a 4x4 all caps font, or a 5x5 with lower case.