It was too easy ;) I never got killed.
Jokes aside. Very nice game! I absolutely love metroid-vania games (My fav game is Metroid so I'm biased) I loved the gameplay, dynamic, fast paced, very good enemies. (The skelletons always got me by surprise!) I was a little lost on the final boss as first I thought I needed to hit his tongue. But the damage animation gave me a clue on how to beat it. (I also never expected fireballs, NICE!).
The writting is very good. I wanted to see more when I finished it! This has the potential of having multiple levels with diferent weapons in a post-jam edition!
From the coding perspective, everything seemed polished and tested.
Good job! I hope to play more of your games in the future!