Click an icon on the button to select the element you want to spawn. Double click an element to delete it. You can drag elements. The joystick moves the camera. When two elements are dragged together, if they have a recipe and match together, then they will merge. If they are incompatible with each other, they combust.
Notes if you’re remixing: Actually change something, please. And, BTW, check the “Sounds” sprite’s code to change the sound effects, and check the “Music” sprite’s code to change the music. There are further instructions in the “Elements” sprite.