Hold left mouse button to grow landscape, hold space to un-grow it. Press "G" to generate the landscape.
Do take in mind that this is a very early version, mostly just an idea for now, I would like to progress it further, and I'm probably going to. Unfortunately Scratch doesn't allow me to increase the resolution without extreme lag, if you'd like to view it in higher quality: https://phosphorus.github.io/#258267593 I highly suggest you do. . . . For the music, just a little ambient trap beat I made, sounds pretty horrible in scratch though, due to the c̶r̶a̶p̶p̶y̶ not too great quality of sound convertion that scratch provides us with, hopefully that will change as the new 3.0 update approaches.