Hey thanks for letting me know your experience with the game! And yeah that other comment is right, going back and up from the crevasse is the actual way forward :)
OK, now I finished it. Looking forward to that cake :D
Just for my own peace of mind: Is there a way to go back from the last section after I closed the two waterfalls? I figured I could try the dive ability on previous areas, but I couldn't find a way to return.
Also, is there a way to get to the chest in this screenshot?
No you can't get back from that section in the demo, but in the full game you get to go back and explore what you missed shortly after, when you're done in Sky City. :)
Also no, you can't reach that chest from the demo, so it's kind of a troll chest.
And hey, thanks for taking the time to finish the whole thing! I hope it wasn't too painful XD