This is not a platformer where you use the arrow keys to move around. You should not follow the instructions because they won't help you. Please don't heart and star, it makes me feel sad. Following is not recommended.
I did not use the platformer code from @griffpatch_tutor because this is not a platformer. I was not inspired by Opposite Day on CrazyGames. In fact, more levels and improvements won't be coming soon. The sound fx were not downloaded off Pixabay.