Modify the game play so that you get points for hitting the thing rather than dodging it.
Steps
Change the things_dodged() function call so that it uses the variable score.
change the variable dodged to score
Change the code when your crash into a thing to increase the score
You will also need to move the thing off the screen so you only get on hit once
eg: (thing_starty = display_height+10)
Modify the code which currently increases the dodged variable and stop it doing that.