Every time you reach a new level, you get Level Up Rewards. They consist of Chips and XP Boost.
By reaching a specific level, you will be awarded a Milestone Reward. These consist of Chips, Lottery Tickets, and Experience Boosts. Note not every Milestone will be granting you Lottery Tickets.

You can check when the next Milestone Reward is available by tapping on box icon in the Lobby section.