Microsoft has made some changes to the Windows Store, which will now inform you as to which apps were built as Universal Apps for Windows 10. If you've been hunting down apps that go well with Microsoft's latest desktop OS, it's now easier than ever to tell the gems apart. Simply view apps on the Windows Store and a "Built for Windows 10" notice will be present on said listings.
The change likely arrived in the latest update to the Windows Store app. It's a neat little addition to the store experience, enabling you to take full advantage of Universal Apps. Do note that if you do not yet see this on the Windows Store, you may need to update your app. Check for any updates, install them and then try again.
Thanks Mohammed Al Q. for the tip!