It'd be good to get a bonus after winning a cup, much like in real life, say something like 25 cash for a cup like the league cup and then around 250 for the world cup
5/5 I don't know how you'd make a sequel but it would be great. maybe if someone comes across your characters abandoned boat, one of the very few criticisms would be that there aren't enough upgrades
the only improvement i can think of is a bit more variety on the levels, maybe add physics too so if you nudge the tail of a car it will spin out, still a great game 4/5