Now fixed and working in the flash player.
Welcome to Pixel Land, here you are a smiley, and your only goal is to build, build, build.
Move around with WASD, W to jump.
Press 1 to switch to block placing mode, when in this mode, clicking moves a block shadow to your cursor, use the arrow keys to move the shadow and press Space to place a block.
Press 2 to switch to hammer mode, when in this mode, clicking deletes the block you clicked.
Press 0 to clear all the blocks and add a platform at the bottom of the screen.
If your smiley dies, click to respawn him.
EDIT: Multiplayer is broken because Mesh isn't in Scratch 2.0, hovever I may update it when cloud lists get added.
It supports mesh!
Simply download this project, then my Pixel Land Mesh Server, host a mesh on the mesh server project, then join it in this project!
Press T ingame to chat wth other people in the mesh.
Don't have mesh?
Here's an excellent tutorial by MathWizz on how to get it:
Have fun :)