Swipe left or right to avoid obstacles and collect collectables. These collectables will navigate using the conveyor belt to specific areas within the level, where you'll earn extra weapons. To unlock new weapons, you'll need to open the orbs at the beginning of these areas. If you want more orbs, you'll need to collect tickets in the ticket feature.
You can see the unlock values for new weapons in the "Deck" section on the tap to play screen. You need to reach the end of the level for the next weapon pack.
Have fun!