The main features in Aluminosity v1.0 are the addition of steel and aluminum tools/armor. Steel tools and armor are much more durable than their iron counterparts, but they still are not as strong as diamond tools and armor. However, the steel pickaxe can harvest obsidian, but the process is very slow.
Aluminum tools and armor are lightweight and fierce, but their fragile nature means that they have less durability than iron tools and armor. However, they still have benefits, such as the fact that they have more attack strength than diamond tools and armor due to being so lightweight.
The rest of the tools and armor strengths and weaknesses you'll need to discover on your own!
Items/Blocks added by Aluminosity v1.0 include Coal Dust, Soft Iron Ingot, Steel Ingot, Block of Steel, Aluminum Chunk, Aluminum Billet, Block of Aluminum, Aluminum Ore and Soul Mud.