Besides killing the baddies and avoiding damage, your third goal should be to manage your movement through the dungeon efficiently. Whenever reasonable, try to move closer to the next door while still doing and avoiding damage efficiently. Do not swap out/burn/use up your best movement cards lightly, having a reusable Move four or jump available can save you several precious turns over the course of a long dungeon. Movement items (boots, teleports) are very valuable not only to for maximizing attacks, but to speed your progress through the rooms.