Hey there! Here's what's new in today's update:

• Revamped the underground structure.
  • This is a test for some tools i've started work on, with the goal of allowing me to create larger and more interesting structures in the game world.
  • Underground houses now generate with loot.
• Added background "walls".
  • Some will generate in the world
  • A handful can be crafted from their respective tiles.
  • Can be removed via the "Wall Scraper" tool.
  • Torches can be placed on walls.
• Added biome variation.
  • Mountainous Terrain - Rocky, and varied in height.
  • Forests/Plains - Rolling hills, sometimes with groves of trees.
  • Deserts - Sandy, barren wastelands
• Added Sandstone
• Badguys can now spawn in the world, in caves and during night.
• Entities now reflect the light level of the tile they occupy.
  • This means you can't see enemies in a dark cave anymore.
• Any saved world from 0.6 is not compatible with 0.7, and will not be loaded.
  • I will likely implement a way to upgrade worlds from previous versions. But this is certainly not soon to be.