There seems to be a problem where the cars tend to spawn side by side. I'd suggest either programming in a limit to the number of cars that can spawn side by side, or creating the ability to shove the cars out of the way. Everything besides that seems be fine though. Fix that and you'd have a nice little game, but as of right now, I don't believe it can really function.
There is no programming error, its just difficulty level of the game. As level increases, the traffic level also increases with more cars to hop on. If you can't go sideways, you have to plan your jump. We have tested our games many times and we are close to getting 1 million hits with users getting more and more top score for the game from other sites. Obviously, you don't want things to get easy when you level up ;-)
This game looks exactly and plays exactly the same as the game crazy taxi. Just saying.
We have already written it as its our official version and remake of crazy taxi with different art style :)
It's a solid game, however, I did get stuck behind a car while jumping over it, do you know why that happens?
I like the art style, it's very eye pleasing.
Its the difficulty of the game, always concentrate and plan your jump with proper distance when you get to higher levels. When you get stuck behind a car, quickly press back button to go backwards a little and go ahead and jump without wasting any time and thank you for the review :)