Howdy Ho!
So we have been working on Hero Siege for mobile on the side of patching etc. We have been optimizing it for phones so that it runs on them as well as possible, which was not the case with the older version.
We also want to support the premium model over free app, so we will be releasing it as a premium "complete edition" which will cost $12.99 and will include all DLC (including collectors eiditions and amazon pack).
There is yet no release date, but it will be most likely on the end of next month!