In order to make  moving solids, there would have to be a recode of the game. At this time, there isn't much chance of moving solids to enter the game without a lot of lag and bugs. Maybe if we get a C++ version of Powder Sim going, we might include moving solids in that. But as it stands now, it is very difficult to have the game make all of those calculations without adding a lot of lag. As for the magnets idea, there might be a better chance of that. Magnets would only be able to pick up powdered materials though like broken metal and broken electronics. We will see what we can do to add that feature into Powder Sim sometime in the future. As for the periodic table, we already have a lot of elements and there is actually a limit to how many different elements you can put into The Powder Toy and the Powder Sim. So there is really no way we are going to put all of the elements in there. We might add more elements from the periodic table that would be considered useful to the game though. As for multiplayer, we don't have the means of doing that at the moment. Until we get a few other things straightened out, there is no way we can really put multiplayer in Powder Sim. Eventually, we will see what we can do to implement a messaging system to Powder Sim, and there are current ways you can make a creation with other people. (You can make a joint account "with permission" and do it that way). Thank you for your suggestions and hopefully some of them will make it into Powder Sim.

I have a question somewhat unrelated to this project for you, in your previous project how did you create your blue flame? 

Additionally I love what you are doing with this project, is there a chance that you will be able to increase the element limit with this project?