I think you answered the music issue. Otherwise a good game.

This game is pretty fun. the shaders and smoothness is amazing. 

some music/SFX would've added to the fun!

Great work man highly polished game 

very calm

cool game and nice concept

Interesting concept. I couldn't hear any sound. I like the vector style graphics!

somehow the sounds didn't work for me, but overall it's a fun idea i like it

nice game, just expected that the corners of the map vanished after a few seconds. the lack of it made the game to me a bit boring since its unique mechanic doesnt exist. but the visual caught me a bit hard. good work!!

Nice game, thank you for making it!

I think you held back on the "complete darkness" and it would be even more atmospheric if the walls are only visible when singing. Maybe it would be more difficult but I doubt it would be too much for most players. Anyways - it is good as it is.

Good luck!