I have trouble looking at the data (not a bug, more like usability). There are huge sections of the chart without relevant information, just long curved lines. This causes me to scroll horizontaly/verticaly with a little lag until I find interesting text. Maybe something more compact would do the trick without ruining the layout.
Before you go worldwide, you're missing huge sections of the US. Major cities such as Seattle, LA, DC, Austin, and Atlanta all have active early-stage tech funders that don't appear on the map.