It's a nice game, but you can add and improve many things. You could maybe add a shop or some sort of skill point tree. You could even add mini games or even add more than just jumping to the game like sliding maybe. It would also be nice if you could go up more levels than 10. But overall it's a good game.
Anyone who quits the game early should think again. You think they're never going to get any good gear. First of all just come back everyday to get some daily rewards, try to create and upgrade all the facilities, and then join an alliance so that you can do raids with them and get some pretty good gear.
Very good game. 5/5 but one suggestion, there should be mini games like: practice mode (for beginners), turning mode where it's just turns and the further you go the faster you go and the sharper the turns are, maybe even upgrades, different colors. Great game though.