What can we do to make ScottPlot better?
Perhaps a new plottable for heatmaps.

Including continuous heatmaps:

As well as categorical heamaps:

var heatmap = plt.PlotHeatmap(xs, ys, values, colourmap);

My experience with these plottables primarily comes from matplotlib.pyplot, both are implemented with imshow. However, in my opinion, categorical heatmaps are just tables with added colours, so perhaps continuous heatmaps ought to be their own plottable, and a new table plottable is created, which can optionally take a colourmap argument?

Check the ScottPlot Roadmap to see if your feature is already planned for an upcoming release:
https://github.com/swharden/ScottPlot/blob/master/dev/roadmap.md