A great start.
The gameplay is solid, and i had fun playing it.
Getting more points for collecting the small green dots adds plenty of depth when the player has to decide if they want to:
a-Drive at max speed ignoring the dots preventing the time from decreasing.
b-Drive slow attempting to preserve your lives and collect the green dots
having to make this choice every time you encounter a checkpoint is excellent for player engagement and depth.
The controls do not really match up with the direction the car is moving.
I would recommend rethinking the control scheme.
Add in a difficulty curve and with a little refinement you have a pretty solid endless driving game.