I am working on a new game which worked fine on desktop but the moment I opened it on Mobile, I was surprised to see black squares in place of sprite images in the game.
After some troubleshooting it turned out that the tile sprite I was using in the game was quite long (around 4000 px) which mobile was not able to handle so the fix was to distribute the tile icons to multiple rows (I kept the width around 1200 px this time) which fixed the issue. Now everything looks just fine on mobile as well.
Go Phaser..