Like a real dig, but without the backache, insect bites and unbearable heat and/or miserable damp. LoL. I hope you will add a sieve shaking mini game (with teeth and small bones) and finding coprolite would be fun (If you haven't added it already).
If the game dose well financially, consider an archeological themes sequel. The industry is finally realizing there is a real market for non-violent adult video games.