Cool project for sure, but it does provoke the obligatory Emacs org-mode as a spreadsheet plug. [1]

I use it often, mostly for my D&D character sheet, but occasionally for work.

Works the same in terminal or GUI, with elisp formula evaluation (including Emacs calc functions), column types, table relationships, and, with org-babel, access to other languages and their libraries (for plotting, etc.) Can even read from DB into an org table and then manipulate data and write back.

[1] https://orgmode.org/worg/org-tutorials/org-spreadsheet-intro...