With version 1.2.8, I've added durability to each vehicle, and the ability to turn on or off vehicle damage for each game mode. With vehicle damage is turned on, when your vehicle durability reaches zero (by hitting obstacles), the game is over.  Vehicle durability can be increased slightly by hitting repair modules that sporadically appear, or when you complete an achievement. 

Other updates include achievements being saved specifically for each game mode, difficulty level and whether vehicle damage is turned on or off. The light banding issue that occurred in later stages of the game has also been resolved.