Hello there! I really enjoyed the aesthetic of your game! I also enjoyed the boss designs and plentiful amount of animations. The music you used also went along great with the art, giving it a gritty feeling that matched with the dirty city you presented!
I encountered a glitch upon dying where I was booted back to the title screen and still in my spirit form and retained a tiny blip of health. After I died from the boss again, I was put right back into the game now stuck as the Magpie version of myself! It was pretty cool, though I'm sure not intended, lol. This happened twice in the in-browser version.
I struggled a bit with gameplay because I did not have a mouse, only a touchpad. As such, I could begin charging the charge attack, but could not execute it. This definitely hindered my playthrus. Also, the Painguin was able to stun-lock me twice, once when I got hit repeatedly by his ranged attack and the second when I went behind him and he wouldn't let me leave the top-right corner.
Overall very good premise! I wish I had a mouse on me so I could get farther than just the second boss. Keep up the good work!