Can I test this game somehow before I buy it?

I want to buy Minecraft pocket edition for my device. I have the money in cash, and I'll have to buy a google play card to use it. The thing is, the app says it's compatible with my phone, but the last time I bought a game for my phone that said it was compatible, I tried as hard as I could to make it work, but it just kept opening a black screen for a full minute and force closing. And when I gave up on it, it was already too late to get my money back from google play. I've run the mcpe demo on my device before, and it ran quite well, but I'm not sure if that would indicate that the newer version would work. Is there a way I could test it before I go get a card to buy it, or would buying it be the only way?