Seems interesting enough, so I'll go over a bit of the process behind our game, Skávo, from my perspective. I, as the pixel artist went into this knowing I wanted to try some kind of Roman or Greek style, because I'd never done it before specifically, and it seemed like a fun thing to try. As the extra challenges were announced, I was originally thinking some kind of stealthy arcade thing set around the Antonine Plague. Despite not knowing about germs, communal diseases and quarantines (although they were not called that yet) were understood to an extent (although the full extent is somewhat debated).
And of course as a pixel artist who has played around with limited palettes before, I had to take the palette challenge. In the end I felt the orange set the mood best, so I went with that.
But as the actual theme of "Take Care" was announced, the 3 of us threw around some other ideas until "Archeology" came up, and with taking care of fragile artifacts as a core game loop. We were all on board for it, and then discussed a few possible ideas for the digging phase, and it was close between Minesweeper, and Picross, but we ultimately went with a Minesweeper top down style.
We were also considering some kind of third translation phase, where you collected enough artifacts and had to piece together some kind of puzzle to translate something, but it was a bit too much for a 72 hour jam, so it was cut in order to better refine what we already had.
Some of these are a bit of a stretch, but that's the setup for how we tried to meet the various challenges.
Take Care: Taking care not to break delicate artifacts as you excavate them.
CGA 4 Colours: With one small exception, the entire game is built out of a CGA approved 4 colour palette.
History: We're digging up Ancient Greek Relics here! Everything you dig up is based off an actual Greek Relic (although very pixelly and simplistic).
Translation: The game uses Greek Numerals which you have to 'translate' in your head to use as a clue. Also the Title "Skávo" is Greek for Dig.
Social Distancing: You're out there digging up relics alone, doesn't get more distancing than that! (Ok we didn't really do this one at all).
Multiplayer: Obviously this was meant as an online Co-op thing to promote Core. But with the simple inclusion of a scoring system, and a high score screen, there is a bit of pseudo multiplayer in the form of friendly competition. After the jam ends, might even be cool to update the in game scores with what people in the comments have gotten!
All in all, while not some major game or anything, I'm really happy with how our 72 Hour Project came out. Thanks to having a small and experienced team, we were able to make a fun little game, and if you'd like to check it out, you can over at https://itch.io/jam/extra-credits-game-jam-6/rate/739112
Edit: some grammar typos, whoops.