Nice game!
I'm impressed by a 3d game like this running smooth in browsers.
The environment felt good and I liked the bubbles coming out of the submarine, the controllers also felt great.
Edit: Forgot to say that the only think I didn't like was the tutorial, I felt it was too lengthy/verbose. I like games that explain things along the gamepla. It was very graphically appealing tho, the instructions were clear and the animations did a good job explaining it.
PS: It is probably my messy head seeing patterns but the divers remembered me of the little robots from Nier Automata hahaha.