I actually made quite an effort to make DGXL work on touch screens. It's not there yet. It's basically read-only on touch for now, but you should have no problem selecting cells and copying values.
It's still possible to enable editing on touch screen, but it asks for a custom <input> element on the page that interacts with the grid, using methods setCellValues & getCellValues. It's certainly possible. Will put up a demo for it when I find the time.
That solution would actually work perfectly well for me: tap a cell and an edit widget pops up.
Cell Editing will be moved to the bottom
Cell-selection handles will be changed.
Formatting Toolbar will be displayed On-demand
Few more enhancements to make it touch friendly. We didnt receive any requests yet for mobile-support. When we do, it will be in our roadmap