Ah, fair then. Probably would be nice to teach the player the direction priority, but I suppose you know that already.
So, there probably should be more mechanics than just fission and crystals going... into slots, right? (what are those slots, by the way? Like, what exactly am I doing? lol) When I think of fission, I imagine nuclear reactions, atom splitting et cetera. Fusion seems like the logical continuation of that analogy. Perhaps combining crystals could not only yield a bigger one, but also a secondary output of singular crystal?
Or is thinking of that as a nuclear process straight up wrong? hMmm...