The challenges you present in the level design work well to guide the player into the final section where one of the siblings is inevitably left behind. I found that the jump was terribly buggy and the characters wouldn't jump more than a few pixels high in many circumstances. The bricks with red on them didn't read particularly well; I thought maybe they were lava until I fell onto one and nothing happened.
Good job making such a cohesive level in a short amount of time!