A more open playground type game sounds interesting! I always love games that let you mess around freely like that and be creative with the objects and how they interact with each other and the player. (Using the fan to get across wide gaps was one of my ideas for a potential puzzle btw!) I'll brainstorm some more about the direction I want to take the game.
I planned to make some ambient space synth music and had a general idea of the kind of music I wanted to use.
To be continued (?)