Block out a level environment
We can start with something simple, such as standard platform games with a side view, so we can get an idea of the journey we must undertake to reach our goal.
If you like platform games, start by putting the player to the left, so we know where to begin. Let's put some icebergs in the middle and give an end to the level, such as a door or an arc of ice the whale must cross. That's the end of the level.