Fix construct 2 compatibility with devices

Hi, a company contacted me about my game, they tested it in various devices (it works fine in my pc browser and S4 mini) I don't possess and asked If I could fix the game to solve these problems:

S3 mini: game runs smoothly, game doesn't fit properly, sometimes the game is flickering

iPhone 4: game stucks at the loading screen, not playable

iPad Mini 1: game crashes while loading the first level / map and the page reloads automatically, not playable

Tab3 lite: Jigsaw bug (due to WebGL, no possible fix)

Are these problems general of html5 or construct games?, should I just say that these problems have no solution?.

Did you export it as an HTML file system, or did you use the specific Construct exporters for each of these platforms?

Thanks for the reply, I exported it as a html5 web project using construct exporter.