— Overall performance is poor.
— The design does not fully comply with the guidelines.
— Slow when filterings all the graphs.
— Bonus goal is partially implemented, pie is missing. 

- huge circles
- check icons is not loaded
- strange values on the y axis
- no text animation
- strange icon near the date on table
- minimap handles has strange overlapped regions

No check icons.

- interval doesn't support day mode

- dark axis labels unreadable on dark background

- night-mode doesn't change buttons colors

- page zooming allowed on mobiles

- if mouse pressed on mini-map border and released somewhere out, then view keep resizing on mousemove even without mouse button being down

- charts named "Apps" and "Messages" - huge perfomace issues on drugging selected interval, chanding selected interval borders, unchecking lines

- no thousands separators in big numbers

- sometimes simple click to uncheck value reads as "uncheck all exept this" action

overview chart becomes semi-transparent if line is switched while tooltip is visible

bad scale

Unable to select time range by dragging in the preview area (outside of the current window).

The dates in the title don't include the final date (6 April 2019) when you select it.

I can't see any timeline (navigator) for the single column chart (Views). Probably just a simple mistake of forgetting to keep display:none only for zoomed mode.

Anyways, I think this work definitely doesn't deserve so many down-votes.