I was able to try out your interactive heatmap at https://lucmazon.github.io/heatmap/ in the Firefox Browser, and was impressed.
However this was only after making a local clone of this repository, so that I could upload the sample JSON and TSV files. For example, using your ergodox files:

And typematrix:

It would be much more intuitive if the website offered that functionality with a few clicks, or even defaulted to preloading these?
It would also really help to add a few pictures like this to the repository readme.
I was able to try out your interactive heatmap at https://lucmazon.github.io/heatmap/ in the Firefox Browser, and was impressed.
However this was only after making a local clone of this repository, so that I could upload the sample JSON and TSV files. For example, using your ergodox files:
And typematrix:
It would be much more intuitive if the website offered that functionality with a few clicks, or even defaulted to preloading these?
It would also really help to add a few pictures like this to the repository readme.