I have just discovered your dev logs and they are fascinating. Your depth of research into the subject, and the balance between graphical design, and practical, exciting game-play that also gives you a hint of what U-Boat crews experienced is impressive. Your point about events that many players wouldn't encounter is interesting too. Obviously takes time to develop those, but they do add legs to a game, and reward the consistent, attentive player. Interesting balance to strike.
This is an instant purchase from me once it's complete and available on here or Play.Date.