Use arrow keys to move tiny one-tile-sized player. This has lots of waiting, so just open up a new tab and play a game while you wait for it to load.
credit to @renembernovember for the music guide: red=lava, teal=ice, blue=water, orange=desert, yellow=hot desert, pink=inhabited plains, green=open plains, purple=meadows, black=holes, and white=snowcaps.