It seems like a basic, no frills UX that works.
The first screen informs the user of their options. When users go into the app they are able to navigate elsewhere easily. It's simple and works well.
It also looks as if the opening screen promotes the app. Person X likes it, and next time you login, or a few seconds later, you see that Person Y likes it as well. This is good marketing. The app is reinforcing itself as a fun, useful app in the mind of the user: "Hey other people like this. Maybe I should explore further."
The main screen does what it's supposed to - it tells people what's in the app and provides feedback that others find it useful and fun.
Can this be improved upon? Yes. If we have user personas and have tests that show that a large segment of users want - or expect - something much different that what is presented (say they expect / want a schedule of upcoming events) then, of course, work will have to be done.