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.
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Yeah I thought it might be confusing, I ended up only having about a day to work on it so I didn't have time for the tutorial. You draw by dragging the mouse over the screen when you don't have a spell selected, you can unselect the spells either by clicking on them again or right click. I'll update it when I have more time to finish it.
Thanks for playing anyway :)