I really like the music in this one! Very bouncy and upbeat.
I think your game would benefit a lot from sound effects, there's not a lot of feedback for your inputs. Jumping, hitting enemies/obstacles, etc. all feel much more responsive and fair with an accompanying sound.
I really like the fake-out jump that takes you underwater (underground?), that gave me a little scare.
I also like how you run right past the princess and get the sweet loot instead.
There are a few rough edges (especially the jump arc), but it's a cute, fun game!