Going D0wn! is a platformer game, in which you have to get the highest score, by jumping down on the pieces of a broken plane and lasting the longest without colliding with the planes tail at the top of the screen.
To change your character, you simply need to press the characters button at the bottom left of the title screen (works only if you have already unlocked at least one character).
To enter the characters screen - press and hold the characters button (also works only if you have already unlocked at least one character).
#At the moment there are no other characters to unlock, but there is more coming soon. Also, if you have reached the score needed to open a certain character before it has been added to the game, it will be unlocked automatically#