Quite a unique idea. I suck at precision platformer usually and this was of a similar case, however this was a lot of fun. Difficult yes but fun. It's visually impressive, I love the background shader and the squid? art. The Visual effects are done well too.
My main feedback would be on the actual gameplay it self, I think the direction cursor feels very floaty, which I guess could be a design decision seeing as how this is a game in the ocean, But I would kinda prefer a more precise direction cursor. But that's my personal preference I think. Even with the way it is, it's still quite nicely polished.
The level design though lovely could be made slightly lesser difficult.
But apart from that this was really impressive, great work!