Man, you absolutely need to put the info about Shift-Click more visible. It's really useful for spells, and I discovered by chance. Awesome mini game, however.
PS: I did it! Lvl.12, with the Warrior, after about 10 tries. Used at best both Food and Heal (while Starving), learnt about the Spells so I used them at best.
Probably the winning chances are good as they are, 'cause of course you don't have to win EVERY time.