https://ali107.itch.io/matter-box

Matter Box is a sandbox simulation game where you mess around with particles.

You can create or Destroy particles. Also, you can choose what particle to spawn in. The particles may interact with each other, for example, if you mix iron particles with oxygen or water particles may slowly cause rusting.

You can also manipulate the particles by either cooling or heating them up, also you can move the particles around using two types of forces, repel and attract. These will cause the particles to either repel or attract towards the mouse cursor if you hold down the left click button.