Hi! Thank you so much for the feedback! but I explained your question in the tutorial,
1) How the AI works?
-As I said in the tutorial, the shark will chase you when you enter its territory, You will die if it catch up on you, but when you go outside its territory it will not chase you.
2) What my controls are?
-I also said this in the tutorial, the controls are A or D or the arrow key left and right.
3) what your ultimate goal?
-Your main goal is to rescue 10 divers within the 10-minute time frame while avoiding the sharks. If you manage to rescue all 10 divers, you successfully complete the game. However, if your oxygen supply runs out or your submarine is wrecked by sharks, the game will be over.
you can also check the screenshot of the game, I'll provide the screen shot of tutorials in there and also in the description.