Arrow keys to move. Remix to make the next version, but always say in the comments before you start your update. Also, if someone already said that they would make the update, you can't do that update. Also, always update the latest version.
Super Mario 2D Land Team: @-NateGames- and @simplep3805 Nintendo for the idea 0.6 changes: finish level animation fixed a problem where you can unlock 1-4 by simply playing 1-1 4 times Level 2, 3 and 4 and more...