Not at all, I enjoy and look forward to critical reviews and such sorts and I do agree with you about the overall theme and plot that drives the game's narrative. I am glad you enjoyed part of it.
The underwater level is pretty hard and that's only because one of the players in my previous projects said that I make games "easy", so that got me and now I am slowly balancing the difficulties in the games. So, basically, you just have to collect the stones, but it becomes easier after knowing that the stones are at the end of the corners, basically it's a 3X3X3 grid so, not hard to locate them. And as far as it goes for the monster, unless you jump or "jerk move away" it won't attack you, but you can just walk and it will be stuck on you. That's a mechanical flaw of the game. Or, you can trap the monster in the ship by going inside.