As others said, autoclicker could easily play this game forever. Also, the motor should be accelerating, that would make the game more challenging. And, perhaps, add a truck for which you can't autoclick your way on the white line, but have to commit to being on the opposite track. Best of luck in future game development :)
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Thanks for checking our game and giving your suggestions! Idea about truck in the middle sounds good but I am thinking probably it would be nicer to have the cars change lanes occasionally to tackle this issue. Anyway thanks for pointing this out again, I didn't understand it correctly when others mentioned previously :).