In "bit Dungeon" there is an almost surefire strategy to surviving. Once you defeat two rooms in a lvl, go back in each one again and again, defeating Fiends and Spirits, until you've got enough HP to get through the next room. I hope this helps you get far in this game.
Another thing. Discuss your Magic combination discoveries. As far as I know, there's Fire, Ice, Gem, Explode, Poison, and Chaos. There may be more. I'm hoping we can make a full chart discussing the all the Magics, but I haven't done much research yet. Any 3 = Chaos, And Fire + Ice = Gem.