Great game, but…

This is a great game, but it only has one problem. I purchased this game a while ago on my iPad, and now I wanted to download it on my iPhone. I played the first chapter, and then it says that I have to purchase the full game. I pressed "restore purchases", but it would t allow me to do it. Does this have anything to do with the fact that I originally purchased this on iPad???

Kai zx 1000 about The Room Pocket, v1.0.4