idea incase you plan on revising or making a squal... On the map, the tiles representing ores should be a different colour, kinda hard to tell what is ore and what is tunnel.
Also, how about a map upgrade where the ores show up on the map in their respective colours (ie, the colour they are in the inventory)
 "Utopian Mining"){kind=icon}
 "Tripod Attack"){kind=icon}
 "Pirates of the Stupid Seas!"){kind=icon}
 "Tesla Death Ray"){kind=icon}
 "The Gun Game"){kind=icon}