I've uploaded the second part of the gameplay series in which I go through two of the singleplayer levels and also explain how to inventor mode works and how to use it.
If you have missed part one, just take a look at the post before this one.
Those who follow the game on twitter might have already seen that I am testing a new "rocket block". The block is almost fully integrated in the game but I have to adjust the settings (like the force, which it generates) and also make sure that it fits well into the multiplayer.
I've also had a look at the new GUI system of Unity 4.6. It makes things so much easier and I plan to port the current UI to the new system and to add the missing parts. Unity 4.6 Beta 19 came out recently so I might already begin to port the UI in that version, as I do not know how long it will be until the final version. With the new GUI, I could also finish the multiplayer sandbox.