Currently there is an ending if you end the day with a full collection log, it uses the same UI as the upgrade and daily report screens to be like a page that fell out of the collection log, someone posted it in the comments if you would like to read it.
These are all really great ideas our idea on a sticky note for this was "Distil Animal Crossing fossil collecting into an incremental side-scrolling dopamine simulator" so you mentioning animal crossing is really apt.
Definitely didn't have time to add anything that causes friction, I would have liked the digging to be more than just press a button but I couldn't think of anything that could still keep the games low stakes feeling. Thanks for the lovely comment!!