Thank you so much for playing! It was A Short Hike by Adam Robinson-Yu! I think that was his name, and I loved that little game, it's around 7.99 on here. I agree about the shadows, finding a good mix in post processing and lighting effects is tough.
I do want to expand on this kind of game it was so much fun and felt like less pressure to design. Using the updrafts as a platforming mechanic to explore broken islands and maybe sailing too on wavey seas could work. Lots more testing to do for something like that though.