After discussing my initial concepts with the team, we have decided on the planet idea.
Using this concept, the player would be an astronaut or alien moving through the layers on different planets when they reach the outer layer they will either use a spaceship / rocket or gravity to get to the next planet. Below is my rough character concept for the astronaut.
Given its size on the screen, the character has to be quite simple. It must also use a very dark grey colour palette so as to contrast against the brightly coloured planets. Below is my concept of the planet selection screen (where the player can see all the planets, see how many collectibles they found and see the locked planets):
David Whitehouse came up with the idea of setting the game in “inverted space”. Essentially its like regular space with inverted colours. This could be quite interesting and would work well with the dark astronaut suit:
To tie this all together I created a new concept that incorporates most aspects of the new design.