Yesterday I was trying to have Gemini help put together a toy model to calculate some financial scenarios in Sheets, and it struggled mightily. The biggest challenge was it didn't have a good way to port formulas over into specific cells, so I basically had a CSV and a bullet list of formulas to put in by hand. From the demo I couldn't tell how well this use case would be handled, but I imagine better in what you've built (will try it out to test it!). I did not try Gemini in sheets, for the record, which may work better than from the chat environment.
I'd echo other comments on the demo being a bit hard to follow, and it'd be useful to be able to demo without having to create an account/sign up, encouraging exploration.
This is now top of my list as one of my favorite data visualizations I've ever seen. I remember spending some time with data for Capital Bikeshare data in DC, which was also public at one point, though looks like it only goes through 2016: https://capitalbikeshare.com/system-data. Would love to see the Lime/Bird version of this. Thanks for sharing.
I'd echo other comments on the demo being a bit hard to follow, and it'd be useful to be able to demo without having to create an account/sign up, encouraging exploration.