Really well done for your age, loads of great ideas and methods you used and the surprisingly good use of cinematic information when the bridge appeared was very effective.
At first I didn't notice the last coin in the middle of the trees and went trying to parkour the mountain via anvil, forge, tree mountain step 1 and 2 then fell off :D
I salute you!
In your age I was just dreaming of making a game, you damned be went and did it!
Keep at it, you've got what it takes.