Thimo Grauerholz on "[Plugin: WP-Spreadplugin] Mobile Improvments"

try the new 3.5.5

you may also add custom css to the spreadplugin and add some media queries e.g.

@media only screen and (max-width: 480px) {
	.spreadplugin-cart-contents {
		width: 180px;
		height: 180px;
	}
}

which is included in version 3.5.5.