Arrow keys! Update, Mar. 4! now you can use WASD (without the S) Press N to make the background change! (WARNING bye pressing N the background will change quickly with many different colors.) Press and HOLD M to make the background stop!
All art done by me! I used the same player and small background from my first project, Funland! See it here: https://scratch.mit.edu/projects/181629714/ Thanks to @carolinebop for some of the code!