Explode seems to me a very good magic. Once you reach a tomb, your magic disappears for only a stun effect.
There are also variations among magic : some create balls flying around you, others have a sort of explosion (of fire, of ice...)
What is the most valuable between attack, life or critical ? Btw, what is the % of chance of getting a critical hit, and does it simply add critical hit to normal hit ? I don't understand what is great in getting "critical" experience, and always prefer attack or life...
Most difficult part of the game : enter a new level with low health after beating a boss, and then enter the second room if 1st room of new level is hard too... don't hesitate to defend attack defend attack...