Call me old-fashioned, but I liek it much better when there's a clear graph with everything on the X and Y axis defined.
I also just don't like the design of the graph you currently have, way too simplistic and bombastic for me.
Also, the design of all of the information under the graph is a bit too underwhelming, everything is just plain black, the text/title size and spacing seems a bit off to me.
It's a good start, but you really need to upgrade the overall look and feel.
I think you nailed my most difficult challenge - finding the right amount of visual playfulness. The two areas are on the extremes sides of this right now. Thanks for your helpful feedback, definitely something I will keep working on (this is the fun part for me).