Mining

Your economy is based on mining. By selling crystals or cards or blueprints you can get energy which is the money used in this game.

To get your crystals use your pickaxe or advanced pickaxe (1) to obtain crystals. These cards will be found equipped by default in the action bar that is under your avatar. Click any of them to use, the regular one will mine 1 crystal per click, while the advanced one will mine 50 crystals in one click.

You will be able to see all the crystals you have by going to Inventory - Craft. (2) Crystals are also used to craft cards.