Thank you for the honest feedback!
We had little to no time to add a proper control guide, so we added a simple text in the pause menu, where all the controls are listed. But, I believe it's pretty difficult to open the pause menu in WEB version, so that's something we'll look into in the future updates!
The theme was used a little more "deeply" than it initially appears. Everything in the game is about spinning something. You spin a gear to start the main mechanism, you fix leaks by tightening (again, spinning) valves on pipes, you solve puzzles by... spinning them. But nethertheless, thank you for your feedback! This will help us continue to improve our project! <3