I made MatterBox, which is a sandbox sim game where you do whatever you like with the particles inside a box! You can spawn and destroy particles, you can manipulate them by heating or cooling them or by moving them around.
I made them so that they interact with each other too. I made it for example that when gunpowder is introduced with fire, the gunpowder will burn off. Another example is that when I add oxygen or water to iron particles, they slowly rust. To undo the rust, you can heat it to its melting point, and then the rust is gone.
Right now, it just needs some fixing and polishing in order for it to look better and have fewer bugs.
