This is a really cool game with nice graphic, catchy music that doesn't distract the player and challenging obstacles. I enjoyed the look of each level and how varied obstacles are. The fact that player has to coordinate fingers with the right amount of pressure creates a nice mental stimulus and engagement that makes the overall experience fun.
This is my very first marble game and I must say I enjoyed it especially the physics behind it. Cannons were the only type of obstacles that gave me problems because sometimes I had to mentally calculate when the next shot appeared.
Maybe introducing the ability to jump and some upgrades to balance the increase in obstacles would add a nice touch to the game but asides this I really enjoyed it. Fun and entertaining.