— Overall performance is poor.
— The design does not comply with the guidelines.
— Sloppy on vertical scrolling.
— Y-scale always starts from zero on graphs #1 and #2.
— Bonus goal is completed, but sloppy on pie chart, zooming in and out. 

- design is not like on mokups
- page scrolls horizontally on mobile
- page zooming allowed on mobiles
- no thousands separators in big numbers
- no animations on value change in interval or tooltip
- huge perfomace issues on drugging selected interval, chanding selected interval borders, unchecking lines
- no check-uncheck transitions in percental chart
- the Y-scale on line graphs should start with the lowest visible value
- problems with pie-chart, see screenshot

No tooltip displayed and no separation when hovering/clicking/touching on the pie chart sectors

Doesn't work, uses absolute paths for data.

The timeline (navigator) for pie chart is of a wrong type

The selected date(s) in the zoomed mode are a bit off the date for which the tooltip has been clicked.

And it is a bit difficult to hover to the tooltip to click it, because it tries to escape to the new position.

I'd make the animations a bit faster, because they make a feeling that the app is slow, but it works well in general.

I don't agree this app deserves so many down-votes. You can clearly see the efforts of the author and all bonus tasks have been implemented. It's definitely not a dislike!

The lines are a bit ugly on different scales in Edge. Also the pie chart seem broken.
But since the Edge is going to move to chromium engine soon, I don't think you need to worry about it too much.