@carlosferrazbr- I can guarantee it costs 1 decillion on the mobile version as well as the flash version. I just recently bought the explorations on mobile after resetting the game.
@xaviersxmen It shows galactic level on the bottom left of the main screen. If you have vortex jumped yet, your galactic level is 1. So if you jumped 3 times, the galactic level would be 4.
@malavern Make sure before every reset that you make, you first sell all of your resources in the port in order to gain lots of money and also to be able to purchase boosts in the office.
You can buy more slots by clicking the little plus sign in the artifact page. It's to the left of where it shows you how many slots you have remaining. Each slot costs souls.
To all wanting more updates, this developer works hard creating new games, and doesn't usually go back and update on older games. There will never be any updates on this game ever, or a very long time. He is currently making Epic War 6, and plans to make Epic War Saga 2 maybe next year.
 "AdVenture Capitalist"){kind=icon}
 "Hero Simulator"){kind=icon}
 "Holyday City"){kind=icon}
 "Overlod"){kind=icon}
 "Epic War Saga"){kind=icon}
 "Bloons Super Monkey"){kind=icon}
 "SAS Zombie Assault TD"){kind=icon}