Meh
~ Animation/Graphics ~
Nothing really wrong with the graphics or animation at all. In fact the animation was smooth and the speed of the ball was perfectly fine in my opinion. The ball and the maze were very simple though. Perhaps something more complex would have made it better, but there isn't much you can do with a game like this.
~ Story/Content ~
This is where the game can improve so much. I might write a lot here, depends on how tired my hands get and how many ideas I can come up with. Before I get into all of that though there was an error on level 3. The ball just randomly went away and I didn't have anything else to do. I couldn't finish the level or anything so perhaps you can look into that.
Something that would have made this game better is by making it harder. You could do this by adding more dead ends, making it so the walls make you start over if you hit them, and adding a time limit. The time limit could be done in a couple of ways. You could have it as a simple counter which makes the person start over from the beginning if they don't finish by then. You could also have "enemies" or something else come from the beginning of the maze and start to fill the maze up so you need to finish before a certain amount of time or it will catch up to you and of course if you touch it you have to start over again.
Another thing that you could think about would be giving a purpose to the game such as a score. You could do the score by giving out points for the amount of time that is left on a timer or even by having them go out of their way to collect coins, which would make the game challenging along with a time limit.
Something else that might be good for this game would be being able to select the color of your ball. Even maybe adding a mini game type thing where the people can draw on the ball and make their own custom character.
~ Audio ~
This could use some good sound effects such as a victory noise if you finish the level or a fail sound if you don't make it in time or hit a wall. (Which of course would involve you doing some extra work as you don't have the time thing or the wall as making you lose) Some ambient background music would be pretty good here with a mute/unmute button that would allow people to choose if they want music or not.
~ Overall ~
Your generic maze game, but it needs to be harder and needs some extra stuff to be close to being considered a good game. Keep working hard though.