You are the green box.
To pass a level, you will have to reach the yellow box.
The black tiles are obstacle that you can't move.
The blue tiles are movable obstacles.
To absorbe a blue tile, press the spacebar key.
When you absorbe a blue tile, you can't release it : you have to deals with the new shape of your character.

Eight level are implemented. Feel free to create your own using every image editor you want : levels are in png. You just will have to name it lvl.png in the assets/level directory. The game load all the level one by one.

Move.
Take blue tile.

Enjoy !