I used to have 3 stars for this game, but after not playing it for a while, I came back to see what changed. First, they did add some really cool new levels and game design! But they also changed the game to be much more ad heavy, they made the new cars be prohibitively expensive, they moved the spawn points really far back if you get hit, and lastly they changed the reward at high levels to be just 29 gold for 1st place. One upgrade costs minimum 9000 gold so it takes 311 races to upgrade once!