Suggestion1: Make a map that is dimly lit, not like destruct, that's too dark.
Suggestion2: Rock monster AI, like the one in Lego
Suggestion3: Rock Raiders weapon set.
Suggestion4: Drill car vehicle, with traction sets.
Suggestion5: Wep pack may include Dynamite Launcher, Wound Cleaner (kinda like medic pack), and any mining tools one can think of.
Once again, Packer, you are ahead of the rest.