Press space to generate Turbo mode recommended. If you want to alter terrain levels during generation, don't use turbo mode until after the green layer has finished. Use 0-9 number keys to alter terrain gen, note that this does not work for negative numbers.
*Yellow background is for contrast so you can see green layer* Negative numbers drop the terrain down no matter what, just at different slopes. Takes about 1m 10s without turbo mode (if [x-terrainChange]=1) Colors in brown area are rocks. They have no significant effect other than looking nice. Colors in gray area are 'ores'. The numbers on the side represent the ore and how much of it there is. All ore is randomly selected and have (with the excuse of imperfect random number generation with computers) equal chance of being chosen.