This is a really cute game! I was initially put off by the download and art style, but I was proven wrong (although a WebGL build would help + art was charming).
Seems relatively polished and I found no bugs when playing. I enjoyed going through the level and seeing the various types of ghost enemies. Never felt too frustrating going around, plus I liked the lighting that you did to sell the experience. Really liked the sound design and the music (you made it yourself??) was actually really nice and fit the game perfectly. The composer on our team is definitely impressed.
The most annoying thing I found was the controls could have been slightly tweaked to make them feel more smooth and the level could have been designed so players don't have to constantly stop to kill ghosts? One last thing, losing all your progress after 10 lives is fine (I would have preferred a checkpoint), but I wanted to see what jumping down the pit would do. Needless to say, restarting wasn't the outcome I wanted.
But I think this game certainly is a gem and a very fun entry into the jam! Good work!