Before playing a level you will navigate through a pre-game screen. The pre-game screen is where you choose your craft and purchase upgrades and new craft. Purchases are made with coins earned by completing each level, even replayed campaigns will earn new coins.
The top left corner displays the players name, total score and number of coins available. Touch the players name button, by default set to 'Player 1', to enter your name.
Under the craft menu you can see the specifications of each craft and purchase new craft when you can afford it.
If you have purchased a craft then you will be able to change its color via this menu.
Occasionally weapon upgrades are available here, for example, plasma balls can be upgraded to bouncing plasma balls that will bounce off trench or tunnel walls until they hit an enemy.