The tutorial is hard to get through. Every time I failed, I had to start from the beginning, and it really frustrated me. The sea is dark, I can't find myself when I fall into it, let alone get out.
There's no minimap or any hint for the carrier. I crashed the aircraft many times while trying to find the enemy ship. MAKE IT MORE INFORMATIVE, for me, half of the difficulty comes from a lack of information.
The aircraft is really hard to control. The sea is really hard to get out of. Maybe the difficulty is part of the gameplay, but there are many places that make people feel nervous, confused.
The aircraft fighting idea is quite creative, it makes the game stand out from normal games. The positive part is that it feels exciting when you turn around and shoot down enemy aircraft, and use other powerful skills to shoot down enemies. The game is quite a time killer if you concentrate on it.