You don't have to install anything or set up an account to start a game in Drift Boss. 

When you get to the game page and click "Play," the run starts right away. Before you start, go to the home screen to see what boosters are available and equip any that you've bought. Boosters that are turned on before the run last the whole session instead of being turned off in the middle of the drive.

The only goal is to stay alive on a procedurally generated floating platform that goes on forever with no end. Your score is based on the distance you go, so every metre the car stays on track adds to your total. The track never repeats the same pattern, and as you go further, the segments and bends get tighter. This means that a long run requires sustained focus rather than memorising sequences.