I was able to finish it quite smoothly, feels good to spam the chicken attack lol. My only complain is that the background of the first levels are a bit noisy, you need to focus a little to distinguish it. 

I like how you used purely jam assets even on the UI and having a boss fight and a leaderboard for your first game is quite impressive, congrats!

You have really put effort into the level design, this is really cool! I go to level 4 and wasn't sure where to go hahaha