I feel like it was a good demo. The only fixes I would say it needs are some hitbox changes. If you die before the troll spawns, and then restart, the troll lands right on top of you, killing you most of the time. Very good, though; I loved the music. It was a very nice addition. Another thing I believe should be added is more duck involvement. I felt like the only thing duck-related was the duck that spawns in the chest.
TLDR
It had minor bugs, and it would be great to have a few more ducks, please! Thank you!