Awesome! Great change of pace from what I've seen so far, original.
I had some trouble with the tutorial, mainly because of the white text. Black outline would be ideal. I had trouble following it, and at first I couldn't understand the goal of the submarine. I have poor eyesight, too, so it was a little tiresome.
I also thought that it was so long. I was unable to memorize all the functions. Maybe a text that could show the name and details of the instrument I'm hovering with the mouse? I noticed there was an element that said "New text"...
Overall a solid gaming experience! Thanks for sharing!
Another thing, please: you gotta tell me how you got the game embedded on the itch page like you did! It's the best so far, so neat. How do you get the player to pop and increase size like that? Is it a custom html file?