Thank you a lot, we are glad you enjoyed our game !
You pointed out two of the three main things we are a bit sad about the game, so we totally agree with your nitpicks ^^. In fact, the Windows version even have the first Shadow encounter slightly modified for it to be more clear, and the music change is a bit smoother when you kill a Shadow (we also wanted to add death particles with that, but we didn't have time ^^'). Unfortunally, the webgl build was too long to incorporate add these changes.
But practice makes perfect, so these are the kind of things we will fix after the jam and be cautious about for the next ones, so your feedback is really valuable, thank you =) !