Click the green flag and move the sliders to change how the terrain is generated. Once done, turn on Turbo Mode (shift+green flag) and restart the program.
Like this code? Try: https://scratch.mit.edu/projects/493233387/ I usually code in Python and this was something I made, which I then made in Scratch. For @epic_fire_ghost's 150 follower contest! 100% by me Music is Fall (Ghost Synth) from Stardew Valley