Some dissonance going on, which fits the horror vibe youre going for. I think its the B transitioning to the F (a tritone) which makes it so unsettling. Could fit well into a game where youre the monster :p It leaves a lot up to the imagination, i dont get a particularly tropical or beachy vibe from this. Without context, the monster could essentially be everywhere, and maybe not even a sea monster! Good job still, its a quite urban track i feel like