I like the basic idea, but I'm not sure what to think about the implementation.
1. What frustrated me most, was that I had no clue whatsoever how I could make progress in the game (i.e. change the starting position).
2. As said, I like the timeline idea. But why does it seem to me that there are soooo many random obstacles like clouds, squares, circles and triangles, but very few accurate historic references?
3. I personally would have preferred if there was a choice to use the keyboard entirely.