I liked the dynamics of having to lead your shots to hit the flying things especially. I also was happy to realize you can hold down the mouse to rapid fire!
It was a bit too easy to be honest. And when I finally just intentionally let enemies get past me I was surprised at how little damage they do to the castle. I lost because of running into the flyers.
This game has potential! Good work on the jam!
EDIT: Also it seems like your leaderboard reset when I entered my score.