Gather resin by dusklight, raise beacon-fires, and keep the lantern alive for three nights — the Gloomlings are hunting the dark.
Survive 3 nights on the fen. Gather resin (score) and brush (beacon fuel) by day, build beacon-fires before dusk, and stay inside their light after dark. Lose all five hearts to the Gloomlings and the fen keeps you. Then restart and beat your score.