This looks so nice and the (first?) hot spring scene is amazing. I don't manage to do the jump with the duck though? After jumping on the right stone I don't get to the top without touching the spikes. I assume this is not optional.
Yeah it is probably the most difficult part of the game and is required to get to the end. Here's a walkthrough video timestamped to the platforming part if you want to see how I did it (or if you'd rather just watch the end instead): https://youtu.be/nAwMHm0XruI?t=379