Click or press Space to start the level. You will slide forward automatically. Then, click or press Space to jump over blocks. You can slide down walls, or jump off them by clicking again. Collect keys to unlock blocks of the same color.

You'll also find power-ups that let you double jump or shoot. To use a double jump, click or press Space again while you are in the air. To shoot, click or press Space while you are in the air. You can only use each power-up once, but it will return to wherever you found it, so you can go back and collect it again.