Hey, thanks so much, for the kind words and for your feedback.
For the movement, you can tell you are moving either by the change in scenery when climbing or diving (blue buttons), and with the cable you are extending when moving forward (red button). There are also metrics at the bottom of the screen that gives you depth and speed.
I wonder, would you say that the scan lines from the CRT shader contribute to the feeling that you are moving automatically? Also, how clear was it to you that the view is top-down, rather than a sideway view?