Other than one set of movable blocks that does absolutely nothing, and a single red bot that shows up periodically at one of the doors, this is absolutely unplayable as there is no feedback to know what is going on inside, and nothing you can do on the outside that does anything at all
Remember to turn on the Sound. If you hear the Sound of the ocean you have done somthing right. If the cube is sad, you have to start over.
So far, I haven't made any progress on this level. It looks like you managed to create some kind of timer, though, since whether you operate the control or not, after some time the cube becomes sad. Another proof of the almost limitless possibilities of Martin's game engine!
Spoiler: The final SUPER SPOILER ;) Pull out the button and push it in at the right speed. If you here a splash... Wait and hope.. If you don't here the splash then start over...
@SJP - please don't rate levels unless you understand them fully. Usually completing the level is needed for that. Also, an explanation of your rating helps the author (and other players) know what you liked and didn't like.