If you got the new Play Store design a week ago and I got rid of it again today, you're not alone. It's one of many Google A / B tests with changes from the server side. Google seems to have enabled the old design again for all users.
The new layout offers a lower navigation menu (games / applications / movies / books), as well as a flat design with rounded corners for search boxes and other objects. That Google is changing the design for applications back and forth, without warning, made us wonder in April whether the A / B test of Google went too far.
The old design on the front side to the new one