Heyo! Time for another update. 

• Worlds will now save and load between play sessions!
  • This is very experimental. Don't expect it to work with future versions at all.
  • Chests will save their contents, but the player will not keep their inventory. (Will be changed later)
• Started work on a "gun" item. Feel free to test it yourselves
• Added more ingots, and pickaxes. As well as the Atomic Drill.
  • Almost all pickaxes had their stats balanced out somewhat.
• Underground is now much darker.
• Some changes to water and lava.
  • Water is now much less laggy, but lava is still unbearable. Looking for solutions currently.
  • Water will now trample plants and some other tiles.
• A few changes to how some placement checks are done
• Hold right click in the crafting menu to repeatedly craft an item. No more needing to spam click.
• Fixed some misc. crafting and inventory bugs.
• Added sand
• Added glass
• Added bottles
• Added crafting recipes for a few potions
• Added scrolls, currently don't really do anything.
• Press "p" to teleport to your mouse.

Go check out 0.6 and tell me what you think. Thanks for your support, everyone!