Use W, A, S, D to move forward, left, backward, and right. Use Q to go down and E to go up. To change the amount of grass, adjust the Grass variable in the top-left, then press the green flag again. You can also change the brightness of the grass, I like it at about 40.
Try using Turbowarp to run with less lag. The original project, cloud, is https://scratch.mit.edu/projects/1238170707 I replaced the clouds with grass and did some more little things to make it look more like grass instead of it turning and flying in the air. I heard I'm supposed to put tags so..... #Grass #GrassGenerator
