— Overall performance is below average.

— The design does not fully comply with the guidelines.
— The app is slow when filtering, scaling and scrolling all graphs #3 and #5 on Samsung J7.
— Vertical scrolling interrupts horizontal scrolling and scaling.
— Total is missing for graph #3.
— Bonus goal is implemented, however zooming animations are harsh.

- buttons and minimap design is not as in mock-up
- no "All" value at plot #3
- no short representation of number in Y axis
- useless button in plot #4
- no spaces for parts of long numbers in table
- no smooth animation between values
- no text animation

Chart 1: moved the zoomer by tens pixels to the left slowly, but nothing changed in the chart. Expecting the zoom window shift, as well as chart data shift.

"Zoom out" shows the full range chart. Expected: show user the range shown to the user before zooming.

Interactions chart: if you disable one of charts, scale of disabled chart still shows 0.

Timeline (navigator) is displayed for single column chart in zoomed mode

The values displayed in the tooltip for pie chart sectors does not correspond neither the sum of the selected dates values, nor the median between the selected dates values. And after some navigation the values can become completely different at all.

Wrong format of dates displayed in titles and tooltips

The width of the vertical line indicating the focused bar is wider than the actual bar width.

Also the focused bar is masked with overlay rather than all non-focused bars.

Impossible to select less than almost a month on daily graphs. Initial date range selection is more than three months unlike the suggested by contest screenshots final month. The date range selection jumps to 100% after exiting zoomed mode.

In general this is a decent work. The functionality is pretty reliable. Absolutely no reason why it has received so many dislikes.