Suggested fix (unconfirmed): Play on a lower difficulty or customize the game modifiers to your liking to finish a run more easily.
The problem
What is mean't with "FINISH a run"??? to unlock next race? Winning the game, reach the end? If so, I am not sure if I will ever be able too unlock one...
Suggested fix (unconfirmed): Hold a mini-barrel in your main hand and type `addliquid [type] [amount]` in the console. For example, enter `addliquid fentanyl 10000`.
Suggested fix (unconfirmed): Play on an easier setting and survive all the layers. Alternatively, use the command "skiplayer 9" to reach the end quickly.