Kronosauras Stuck

I've been really enjoying Dave the diver for a while now and know I'm coming to the end. In this last run I did both of the control room door openings (the beluga and swama one). Usually when you get to the next point in the game it pauses, tells you that you need something new and then to come back later.

When it told me to go to the control room door I was like... Well it'll probably do the same thing as it was jammed. I've got a bit of oxygen so can make it down, suss it out then head back up.

I've never been so frustrated as to when a boss fight starts (after I just beat another seriously!)

The boss is also not in an arena where your air stays level, is big and does massive damage. Its lunge attack can also not be dodged well half the time and the predictability of where it spits rocks is terrible. I attempt it half a dozen times and then when hitting retry again I accidentally hit down before hitting to continue. Now I'm being told I'm going back to the boat with one thing.

You are telling me from my massive run I keep one thing, and I can't choose to back out of this choice and try and beat this horrendous boss placement.

At this point whilst I like the game I've just been trying to finish it more so recently and I guess my question is, is it worth it to complete those puzzles etc. again just to get to the final chapter? They were honestly super boring and I'm really not excited to do it again. I can't believe there was no save. Like I do want to see the end but honestly this last run has really drained me and I doubt I'll come back to the game once I move on.