use arrow keys or WAD to move, if you fall off the islands or touch lava you die, touch the black portal to go to the next island/level. If you decide to remix, just add a new costume to sprite 2 and put your level their to make another level, or change a costume I already made to change the levels.
If you press see inside you will see that the code for this game is very different and much simpler than other scrolling games, while still being as good, if not better. Also, this is not a game, it's an engine to show a new and easier way to make a scrolling platformer. Feel free to remix.