The mechanic for recharging the spells is pretty interesting! Unfortunately, drawing the Life spell left me with 0 spells instead or recharging it. If you plan to continue working on it, assigning keys like 1 to 4 to select/deselect the spells would be useful. Also using space or any other key for deselecting all spells could help. And the dots for drawing could be shown (maybe with some transparency) when no spell is selected.

It is very confusing, even with your description. I couldn't figure out how to draw, only how to click the screen and spells. Didn't understand the game. Perhabs a simpler idea might be better next time, as you know there isn't much time to do it. A fullscreen option should be there too.