Instagram Category Search Concept

I was browsing through content on Instagram and had an idea that could result in improved user experience and increased user engagement. I dove in and built a prototype. Here's more about the project:

Goal:
Keep users engaged by increasing the number of content categories that a user interacts with when exploring new content.

Browsing Categories Today:
To browse through categories, Instagram users will scroll through search categories using the horizontal scrollbar, which shows three categories at a time.

Hypothesis:
Because it requires more swipes to get to categories at the end of the scroll bar, users interact with them less than the categories that are listed earlier in the list. If the user were to see more categories in fewer swipes, the user would explore more categories.

Prototype:
The concept allows Instagram users to see all of the categories at once with one single swipe. If the user pulls the category scrollbar downward, the horizontal scrollbar expands into a grid containing all categories appears. When a category is selected from the grid, the grid collapses into the horizontal scrollbar, with the selected category underlined and on the left hand side.