The level is a little bit harder than the first level. There is a skeleton mage which can damage on both of your heroes from a distance. Also, this is the first level you will fight a boss - spider. The boss can also summon small spiders while it is still alive. You just need to watch for your health while taking it down.
There is a door with a skull next to it. You will need 2 gems to open it. Those gems can be found on this level. Search through the level - chests, jars, etc.
You will see a strange spot saying that it is covered by dark fog. The spot is near by the stair leading to the next level. It is for later once you get to Gloomy Caverns level.