This app was mentioned in 1 comment, with an average of 9.00 upvotes
Hm, that looks oddly familiar. So by "I wrote my first Cardboard app" you mean "I downloaded the free Make Your Fantasy Game asset and dropped the Cardboard SDK camera into the demo scene"?
Sorry to be such a party popper, but I am slightly annoyed, as I actually installed it against my better judgment based on the "Weird things start happening after a while. Don't stay in too long." description. While Graveyard VR is implemented as a fly-through, in yours all I can do is look around. After some time footsteps seem to come closer and then walk away, but as nothing is visible, I wouldn't count that as "weird things happening". It is basically the demo scene, trees surrounding the graveyard, probably from another asset, plus some added noises.
Dropping cameras into pre-made scenes from the asset store was sort of fun six months ago, when there were almost no VR apps available, but by now these have sort of become the Flappy Bird clones of VR. Minimal effort for the author who usually forgets to mention the asset artists that did 99% of the work. But not really a compelling VR experience, as in most cases you cannot even walk around, just stand and look. So my feedback is "Please a little bit more effort and a more accurate play store description". (And yes, I realize it is free, but my time is not.)