If you ever get stuck on a level, review the README and be sure you're trying each ability out.
If you can't keep your health up, be sure to rest when no enemy is around (while keeping an eye on your health). Also, try to use far-ranged weapons whenever possible (such as the bow in the "Baby Steps" tower).
Senses are cheap, so use them liberally. Store the sensed information to help you better determine what actions to take in the future.
If you're aiming for points, remember to sweep the area. Even if you're close to the stairs, don't go in until you've gotten everything (if you have the health). Use far-ranged senses (such as "look" and "listen" in the "Baby Steps" tower) to determine if there are any enemies left.