Thank you for commenting! Your ideas are great, although they will be hard to implement.
Companions will probably come to the game at a later version. Currently, the main focus will be on making the first story chapter. When it is done most of the more essential features of the game will be present.
As for potions, they will get an overhaul pretty soon. They will not be as 'advanced' as the previous game's, but will definitely work in a different manner as they are currently quite overpowered.
Finally, mobile will be very hard to do, as it would be like making a whole new game. As I said, the current focus is to finish the first story chapter, after which I may try to make a mobile adaptation, if it is demanded by the community.
Also, as for content, stay tuned for the next update, which may or may not be coming in a few days. :)