Good idea, very simplistic in a positive way: you quickly understand that the core challenge is really fighting the wind to keep your course. It creates a calm but strategic atmosphere, and it fits the jam theme well.
The mechanics are interesting: the wind shifting with time of day, the no‑sail red zone, the wind‑based combat mode, the rough navigation plotting… it all works nicely. The challenge of finding places is enjoyable too, even if sometimes a tiny bit more guidance would help.
Overall: solid concept, simple but effective. Well done.