Had a play of your game in this video here - at 51:30 -, where I give my thoughts while I play. Hopefully it's helpful feedback.
Brilliant audio work! I can't remember the last time I could use sound so clearly in a game like I did in this. Solid concept and execution overall.
I would love to see a version of this expanded upon where you had an additional goal while you had to fill in the holes. Like a rouge like where you have to find tools to let you reach the further levels of the submarine.
If you have time I'd greatly appreciate it if you could give my game a go to, happy jamming.