Just a marketing note, as I haven't tried to use this yet, but starting the feature list on the page with "pinch to zoom" striked me as pretty odd. Sheets (Google or Excel) already do this, and even if they didn't I don't personally find it to be a killer feature anyhow. I know the point is pinch to zoom + infinite sheet, but the pinch to zoom doesn't strike me as interesting there from a marketing perspective.

To pick something else -- I again haven't used it yet and might not be in the target market as I don't find myself saying "I wish my spreadsheets had more functionality" -- but if I were, I'd probably lead with more of the flexibility or collaboration functionality (e.g. "write Python not VB", even though Google Sheets lets you write JS at this point.)