For the relic window, yes I do mean the "Better luck next time..." button. It's nice that when you do get the relic/coin, the window automatically closes in a few seconds, just wish to extend a similar courtesy to make getting back to digging after losing quick as well (I find myself missing the button by only a few pixels multiple times).
As for the lore consistency, yeah I think keeping anatomical correctness is a good idea. I bet you could even have some fun with them like puns.