Craft your way to the top by progressing through different tiers unlocking new items and structures to use. Structures can be upgraded with a ticket purchased from the shop to improve its functionality, this is dependant on the structure type.
You start the game with nothing but your hands. Find a nearby tree and use your hands to gather logs.
Logs can be used to craft a workbench by opening the crafting menu. Place the workbench down anywhere you want outside of the shop. Open the workbench to bring up a menu that displays what you can currently craft, you will see more items unlock when you reach higher tiers. Your goal in this tier is to craft a wooden pickaxe to start mining stone which can be found nearby. After some mining, you will eventually be able to craft a furnace and smelt stone bringing you to the next tier.