I really like the pixel art and the different types of obstacles you added. However, I think the gameplay could be improved a bit to make it a little more fair for the player. No matter what I did, I seemed to hit obstacles. I also wasn't sure how to start the game at first and wasn't sure why it was linking me to Youtube.
I think this would benefit from an endless runner type format, where the cart is constantly moving and you just have to focus on jumping to avoid the obstacles in time. I really like the premise, and I think it has potential to be a fun game. It just needs a little more development. Still, lots of fun.