The problem is that you've put an image there that looks like the app and when you press it it actually loads the image separately, making it feel like it's interactive when it's not.
On my phone there's no indication that there's more content below the fold and after it has opened the image the content is gone.
Hi Kiro, did you try the app store or google play button? That worked for me, that are download links
The problem is, they are below the fold, and many mobile devices hide the scrollbar. The way it's presented, it's very easy to mistakenly think that image is everything you're getting.