To reach new levels, you need to collect green tickets
Please tap on the green ticket (level) icon at the top of the screen to see how many tickets remain until the next level.
The tickets you win during the game are added to this progress bar. As soon as you collect the required number of tickets, the progress bar will fill in and you will level up.
Please note that the tickets you win during the game are not added to the level icon at the top directly. The level icon shows your current level in the game.