In each world, you have to find a key in order to go to the next world.
This adventure game is about finding a key and entering the next world. Look for critical environments. There are several puzzles. And once you find the key, you can teleport it to a new world and search for it again. Don't worry that there is always a way to pass even if you are stuck. And there are no hints. You have to understand it yourself, or you will be stuck in the same world for a long time.
The player is lost somewhere in another world. If he/she finds a key in every world he/she can teleport and go home. But each world is like leveling up. It becomes harder and harder to go into another world. The player doesn't know how many worlds are there. The "Key" is the main part of this story. Without the key, he/she cannot go home.
But... It feels good. Because the player will discover things he/she never seen before. The player will discover a new world every time when entering or teleporting, will discover mystical unknown places. Some world feels empty but still beautiful.