As mentioned below (or above? Can't remember how itch.io comments work), short but sweet. The gameplay mechanics that are there are well implemented, good job!
One note: I know you state the controls are the arrow keys are the movement controls, but I was using WASD which worked, and wondered why the sound kept turning on and off every time I moved down :P Just one thing to bear in mind for players who may want to play with WASD controls!