I really enjoyed the polish in this game. The sound effects were on point. Music - it was good but maybe adding more battle themes could help. Really nice aesthetics and colors. I liked the feedback, when you were shooting.
I don't really understand the connection with the theme. I guess that you have medusa but that's basically where it ends unless I missed something.
Unfortunately this game suffers a bit from pacing. The first level was really slow and easy and I beat it without any problems (though I was a bit bored). And in the second level everything was suddenly really difficult. The first encounter left me with 2 hearts and in the first level I was only hit during the boss fight. Maybe if you could make the transition a bit smoother, then it would be a bit better.
Still I really enjoyed this one! Good job!