Arrow keys to move. Outline and fill quality decrease when the size increases. Don't be surprised if it glitches. There are some problems. Squeezing yourself into a corner (corners on the edge don't have the same effect) will cause the blob to go into absolute chaos (I did a slight level change so this glitch cannot be done with the current level design).
Now can change gravity Size and jump can be changed to Maximum and Minimum- You'll see Changes colour with time and sound and gravity levels and size https://scratch.mit.edu/projects/581886159