My main criticism here is that there doesn't seem to be much strategy as both you and the opponent are always completely blind to what element the other one will choose and the elements themselves are completely balanced. Even after working out what element wins in every possible matchup it still plays out like rock paper scissors. Still, you have an interesting concept here and I'm curious to see you expand on it a little after the jam. Good effort regardless!
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Informations are in the game page (not the jam page).
The opponent can only cast one of the first 3 spells, at the start of the game the strategy is to choose to cast the spell which is weak to his opponent's 4th spell. So at the beginning you can win easily and start choosing bonuses that will determine your strategy. But hey, in reality it remains rock paper scissors against a completely random opponent.
Thanks for the feedback!