I wanted to go with the "false reality" theme, combined with "gone wrong". The idea was to give the player the impression that it was just a simple fishing game (false reality). After a minute or so of play time graphical glitches would occur (false reality gone wrong), the world would fade, and it would be revealed that the player was locked in a simulation chamber on a spaceship. The player would escape by solving puzzles.
But in the end, it really did just become a fishing game haha, as I didn't have as much time to work on the game as planned. :P