This looks cool but I was thrown by how the heatmaps were organized; having seasons as rows and episodes as columns would be more natural to me.
Feel free to open up an issue on GitHub, maybe we introduce an option on how heatmaps are shown :)
Filing an issue on GitHub is the correct thing to do. It has higher visibility for a longer period of time than a hacker news comment and is more likely to resolve the issue while wasting less time of the maintainer's and anyone else using the software.
edit: It seems you've been upvoted back to normal. Ignore me.