Nice game, but as other said I also had a hard time getting what to do.
After a while I get to gather oil to generate energy to send in the top center machine, making the game cycle.
A little more UI feedback would be nice as some start tutorial path on the ground to learn the game cycle faster for new players.
Good game and good aesthetics, sounds were good and the gameplay was smooth.
Keep the good work! See you next time :D