Yeah... can you tell where I was rushing in the last few minutes of the jam? LOL. I do admit to being bothered by the problems with the cave exits but I was literally in about the last hour (you'll note I submitted with 16 seconds to spare) and I didn't have time to code the checks, such as the ones that are there on the water and when you arrive on the island, to make sure you do everything important before you move on.
Same with the lack of guiding art elements that you mention - I hadn't figured it out (it was something I didn't think about until I was putting the scene together and then realised it was a problem I hadn't anticipated and didn't have a quick solution for) and then had to abandon doing that in order to finish up in time.
Thanks for noticing the sky reflection! I spent way too much time on that in combination with the palette stuff that I mentioned in another comment but I'm happy with it.
I'm really glad you enjoyed the game. Thank you for your kind feedback.