Wow, congrats on actually finishing it! I'm well aware that it is quite long. Yeah, the lamp orb is pretty tight timing wise, I tried to make it slightly easier by adding a few water streams to speed up the way to get there, but I didn't have enough time to redesign the whole part. It also suffers from a rather harsh brick wall (the fact that you need the knife and pickaxe items) that is only apparent right at the end.
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Yeah that also made it pretty hard to find - I avoided grinding for that spot until I'd exhausted every other location! When I first saw the kelp/rock combo I had thought that when I had the flippers they would work like the air tanks and always be equipped (which actually it probably wouldn't break anything at that point if they were?). The overall grind was long but also rewarding - I think that section is the only bit that super stands out as needing rebalancing. It's pretty well paced once you figure out where to get everything!