Risk of Rain (Level)

Spawns
Elder Lemurian

Temple Guard

Clay Man

Young Vagrant

Archaic Wisp

Bosses
Imp Overlord

Scavenger

Providence

Gilded Worms

The Gold Chest
Sometimes, a gold chest is enclosed between two walls, if you manage to get to the same level as the chest, you can access it by going down a hidden rope and then going to the right.

Secret Area
Contains a secret area found by going off the ledge past the cabin area and entering a tiny crevice in the wall. Must at least have Photon Jetpack or you will fall past it.

UPDATE: In this area there are three golems dancing around a beatbox. Getting close to the beatbox will stop the normal musica and play an electro-dance theme. This DOES NOT require the Photon Jetpack, buy maybe having a couple Rusty Jetpacks can help thanks to the reduced fall speed.

Map
In the middle of the map there are 4 closed rooms which require 1 keycard each to be unlocked - Medical Bay, Cabin, Armory and Storage.

The Medical Bay contains several medical beds with little cabinets besides them. Opening them will give you a large heal, as well as the chance of a medically themed item (known: First Aid Kit, Prescriptions,Soldier's Syringe). There is also a large surgical bed that you can teleport to the final boss fight. Activating it during the final boss fight will heal you and your drones fully, although it has a long cooldown before it can be used again. There are also a few chests.

The Armory contains a large Gauss Cannon that you can teleport to the final boss fight. Activating it while Providence is in front of it will deal a large amount of damage to him. It, like the surgical bed, has a long cooldown before it can be used again. The Armory also contains ten golden chests/suitcase-like things that contain items, but have the chance to contain nothing at all, as well as several normal chests/containers.

Storage contains lots of chests and containers. Some of the chests/containers are inaccessible without certain jumping items/abilities.

The Cabin contains a 'Nano-Chest' that you can teleport to the final boss fight; there are also several Roulette Chambers and Chests.

Various little indicators on the ground will show you a map of the ship and where you are when you are over them.

To the right of the map you will find a computer asking to take you home. Press "A" and prepare to fight Providence.

It is possible to become stuck in the cabin (and enter it without the use of a keycard) by negociating your way to the very top left of the map and heading right. When above the armory and storage, head over where you fight the final boss and drop off the edge. When you teleport back you will be in the cabin, where it is impossible to leave without a keycard, so farming until one drops is your only option if you have none and haven't opened the door.