I recently downloaded this game because the dev was giving promo codes on Reddit. He had released the game months ago, and received no attention or reviews.
Now I'm guessing it's because like some of you, you see a game like this, and think, "Oh, another 2D bike game" and move on. Having played the game, I think it's a shame that this game didn't get the attention it deserved because it's great. It's definitely more in line with games like Trials and Bike Baron, with responsive controls, great physics, nice art style. You can tell that a lot of effort has gone into the game, from each rider having his own little bio, or different poses while switching bikes in the garage, or how the levels get Limbo-style shaded when you enter caves
It may not be as challenging as Bike Baron, but Pocket Moto X is certainly worth a try. There is IAP, but the game seems very fair and well balanced in regards to how much currency you earn.