We will add a passive tutorial for them first time you enter that screen, so far we have not given any explanation for that system as we knew it needed a revamp (which was implemented in version 0.2.3), so those values have more meaning for the player.
We are trying our best to clear up all the “partial” parts in the game as soon as we can, including the lack of Partner levels. Please keep an eye on our game for the upcoming updates