This is immaculate, I loved it. Everything works together really well here - the main character's arbitrary task to collect petals displayed as a gameplay objective, the soundtrack's build-up as the mountain is climbed, and overall, the writing behind both characters' dialog is just... great.
You really know what you're doing, honestly. I have almost no criticisms - this is a great little narrative about trust, ambition and support, and it fits itself perfectly within its gameplay. It kind of reminds me of Celeste, in a way.
If I have just one piece of advice, it would be a small Godot trick - you can switch to 'Characters After Shaping' in the editor label (inside the 'Displayed Text' tab) to avoid having text at the end of a dialog box suddenly jumping over to another line, while the characters are being loaded. It's just a little visual improvement.