I guess that would help you get all the edges of the cave in, including the little rocks at the left of frame that I seem to recall were the tricky bit, but iirc without a special lens the ratio of cave mouth to middlingly-distant islands/rocks looks off too (the rocks take up a lot less of the cave mouth than you'd expect). I think that's what the issue was anyway, it's been years since I was there and I don't have my old phone to check the photos as a reference point. I know we didn't try panorama mode but I don't think it would have solved the issues with proportions/composition.

You can still get some neat pictures there but I recall it being impossible (for whatever reason) to exactly replicate the composition of this one with a regular phone, even with the original as a reference and considerable effort.