Maybe it's because I only got 2 or 3 levels before getting bored, but...I found the following:
1) Lightning is way OP.
2) Ice is useful because it hits multiple enemies multiple times
3) Fire sucks. Not only is there no explosion or anything, but it deals lower damage overall than ice, travels slower, only hits one opponent, is summoned slower... it's really useless.
So the game was "use lightning unless someone started getting in close, then switch to ice, then switch back to lightning".
I dunno, with only 3 stacks to use and having them that imbalanced, I just got bored.
This is just a personal thing, I guess, but I would find this game more entertaining if you could switch between different attacks in the same element (like say... buttons 1-3 for what attack you were using and q-e for which element)