Pretty neat
Some really neat graphics and smooth gameplay. Nice music too. I like the overall look and feel of this game. This felt alot like a game I have on my phone. Just rolling down and down and down.
But there's just way too little in this game. You can easily add a ton of small little extras that would make the game both more interesting and more challenging instead of just waiting for the scrolling speed to reach a level of impossibility.
You could add maybe a hp bar and some health packs, together with spikes and traps and enemies to avoid on certain platforms. You could make certain obstacles that required you to roll underneath them or you could even put monsters in there that you could roll to kill. I see that you made the platforms tilt a little bit when it progressed, but that didn't seem to do anything. Why not make it harder to walk uphill and easier to roll downhill. That way you wouldn't need to rely on only the speed of the upwards scroll to be the difficulty.
And that's the main problem - the only thing that makes this progressively harder is the speed. And that's far too little. It's too basic and too empty. When there's only one variable in the difficulty, it makes the game a one time play and gets really boring. Eventually you'll reach a certain score that you just can't play anymore because it's too fast, and then what? If there's nothing there to help the score, why play it again?
You've got some nice art. Now put in some features to really compliment that. It'll really increase the replay value here and make this game a real kicker.