Hi there, I bought Greed from the Playdate Catalog and it's awesome! My family played a variation on it growing up, so it brings back a lot of memories with my grandfather.
I think I found a bug! I've noticed that if you roll a bust, player input is still enabled for a very short time (before the BUST! graphic appears). This means that if you're quick, you have time to select a die before the turn gets passed to the next player. (All other dice that were previously selected will be returned to the selectable state, but not the one that you've selected). All dice are then rolled, including the selected die. If the next player is a CPU, they won't know how to un-select that die- meaning that if the selected die doesn't contribute to a score, their hand cannot be validated, and the game locks up!
Your game isn't stuck forever. If you just return to the main menu and start a new game (abandoning the one in progress!) then you'll be ok. You will lose the game in progress, though. Interestingly, if you try to resume it, it still stays in that broken state- so I guess you're saving the selected dice as part of that!
It's a pretty funny bug when it happens, as long as you're not in the lead. I think this would be pretty easy to fix by preventing player input until the roll is determined not to be a bust.
Hopefully that's enough info to be able to find it! Thank you for making art! I really love it!