The purpose of the currency icons should primarily be to tell them apart easily. At a bare maximum, different colors and shapes, but really the best solution on top of that would be to have them in separate tabs (stores) so there is no question what you're spending where.
I don't think anyone is spending crystals on store refreshes anyway so it wouldn't be detrimental if we had one store per currency.
Another thing that is hard to see on a small screen is the conquest stars - 2/3 vs 3/3. Just make it *, ** and *** instead or some other way to show a node as completed.