Please do not waste any money into this game. You are going to get nothing out of it. The dev already said the game is not going to be developed further.
I believe the game was designed on the run, and there were several missteps in the game development.
No forethought was given to how to incorporate the dragonscale and sphinx spirits that we will never see, as the sirius was approaching 100 retained morale.
All they were doing with HR bosses was adding more HP, so they didnt know how to program in the 3rd sub.
And for some strange reason the well soon ran dry on new heros, something that could have sustained further interest in the game and revenue for themselves.