I was looking forward to this because of the sea theme, but I enjoyed it even more than I expected.
The core gameplay of aiming with the shoulder buttons was really smooth and addictive. It put me in mind a little bit of Worms for some reason. And the Boss fun!
And you can't go wrong with a grappling hook. Maybe make momentum carry through though. It definitely works fine once I realized you have to hold a direction to move after release, and maybe it suits the retro look better, but part of the fun oof grappling hooks for me is the follow-through of the physics.
Agree on the Left-Right camera thing. This is why I never implement it, because while it makes sense for visibility, I can never get it to look/feel natural.
I wasn't sure where to go after that though. I tried going back to the start thinking the grappling hook would unlock a new area, but no dice. Is that the end?
If not I'll finish it. If so, I'll post my record of my gameplay.