To increase player level, you need to earn XP. You can find the XP counter on the avatar icon in your profile. Tap on the star to see how much experience you have left to collect to get to the next level. The higher level you get, the more XP you need to earn.
In order to increase the player level:
- complete the quests
- renovate buildings
- complete the orders
You will unlock new awesome items as well as valuable resources with level-up.