Play games
Choose the game that interests you and play itfor free.
Complete the quests
Every game has some quests for which you will receive Soul Gems.
Receive rewards
You can exchange your Soul Gems for Steam Wallet top-ups, game keys, CS:GO Skins and other rewards.
Been playing it a little bit and I'm not sure what makes me "level up". Is it my hero level? If so, then how do I increase my hero level?
The game UI is ugly and clunky, feels like it was designed for a smartphone. The kingdom building mimics other "build-your-own" systems like Clash of Clans but with weird, irregularly polygonal preset boundaries. If you want to play at kingdoms, Vikings is a much better choice.