Once we decided on a floral, boggy, planet aesthetic, I got to work creating two types of effects. The first would be metallic and synthetic sound effects for the player's ship and it's functions, and the second would be natural, organic sound effects for the aliens that attacked the ship.
Both of these styles were taken into account for the main theme of the game, which began with 1 minute of synth build up (for one minute of preparation for a wave), and one minute of an orchestral crescendo (for the minute of aliens attacking).