Use the arrow or WAD keys to move (there is no use for the S key in this game) There are two easter eggs, one is activated by a certain key and the other is a click! For the key easter egg, you'll have to hold it down or spam it to see a difference in the sprites, but there'll be a lot of noise!
UPDATE 10/28/2022: ADDED THUMBNAIL I had to watch several youtube tutorials because I forgot how to code certain things, but I made it. It's finished now after weeks of sometimes working and sometimes sitting at my desk wondering what to do! Hooray!