Game works when launched from engine but not when downloaded from play store

Just as the title says, my game worked fine when I used the launch option from the engine. When the same game was downloaded from the play store, to the same device, it had massive lag. So I’m wondering what the problem could be?
The device used was a Samsung galaxy s4 mini.

Thanks in advance!

Was it the lag or was it just some bad FPS/performance? You might have not optimized it well enough for mobile, or if you’re having networking issues (lag) then it might be a bad connection (GPRS?)