This heatmap visualizes monthly COVID-19 cases across seven European countries in 2020, using color intensity to show case counts from January to November. It loads CSV data via p5.js’s `loadTable`, aggregates cases by country and month, and renders the grid with p5.js `rect` and `map` functions. Hovering reveals exact values through a tooltip, while a color scale bar displays the range. The visualization includes months and country labels, axes, and employs Plotly indirectly via an included script tag, though the heatmap itself is custom-drawn on a p5.js canvas.