I'm sorry you got sad because of my comment. I can see you've poured lots of love into the game.
Perhaps the web version decided against loading the music. Maybe the sound effects were there and without music, they felt insufficient.
I feel like this game is not my cup of tea, so I'm ok with it being too difficult for me. I like very few strategic games, I'm more of a tactician - Frozen Synapse and Into the Breach are at my wavelength.
I know how you can get used to a certain way of viewing your game so my purpose was to show another perspective, not to rain on your parade. You've made a game that feels polished and it is a big feat!