I believe it has been suggested since months ago, but seems that the dev is still busy to work on something else.
Mobile version is a must nowadays as many players like to play with their smartphone including me.
Well, I assume that both of you assuming to have an apps version. Most android phones as of now can access the website through chrome or what browser you have on your phone. Indeed, I think the mobile app version is not necessary and probably it will happen but not now.
Or there is something must be prior to developing than the mobile version.