The layout and functionality of the app are effective for professionals to analyze the visualize the data set, though a minimal amount of description of the data set may help better understanding at first glance.

The interaction functionality between the map and the data table allow users who have specific regions to investigate in mind to better explore the data. Also, the data-exporting action buttons give the flexibility to satisfy the needs for different file types. One aspect I would suggest is to include a button to select and download data for multiple and all the states. Also, highlighting how the map and the data are linked would be helpful (i.e., highlighting the instruction above the map).

For the user input filtering widgets, they were properly chosen based on the data set. The biggest confusion to me is the checkbox group for Size of company. It is not intuitive to see if I have selected all sizes of companies because the checkboxes do not change. Besides, it seems like missing values are not found in the dataset (i.e., the map crash when I only check the Missing).

The Models section is a convenient feature for the analyst, but it seems to a static analysis that the filters in the Exploration section have no impact on it. Specifying this in the Models section would cause less confusion.

The app is very effective in terms of helping people analyze and visualize mental health data in the tech industry. People who want to gain more insight into how mental illness is perceived in the workplace will benefit greatly from this app.

The reactive functions are quick which allows for a pleasant user experience.

The black, white and red colour scheme is clean and consistent across the user interface. The only issue with the colour scheme, is the black sidebar menu that does not catch the user's eye on initial view. However, once it is discovered it becomes a frequently used feature of the interface. The subtle menu item icons is a nice touch, and makes the compliments the professional look of the app well. I would suggest changing the colour of the sidebar menu to a marginally lighter shade of grey - this will make the user aware of the sidebar menu sooner, but should still blend in with the background when user's attention is fixed on the main white panel.

The user input filtering widgets have been chosen appropriately. Filtering age with a range slider widget makes a lot of sense, due to the large range of discrete age values to choose from. On the other hand, categorical and binary variables, such as gender, can be filtered easily with radio buttons and dropdown menus. The only critique I have for the widget functionality, is that all checkboxes aren't visually selected by default when the "Select all" option is checked for the "Size of company" filter. It would be a more intuitive user experience if a reactive event took place when this option is checked.

The hovering functionality on the map is an elegant solution to displaying summary information per US state. The single click functionality on the map is another user-friendly solution to accessing more detailed information about a state.

The data exporting action buttons is a functionality that sets this app apart from other data analysis apps.