Yeah, only web version has music, see the notes on the main game page (Linux version should have at least the sound effects, though). Just in case, I've also tagged the jam version on github, so it can be played from the terminal with:
go run github.com/tinne26/transition@v0.0.1-jam
Hmmm, checking again, the general volume may be too low. I tested with headphones only and it was fine for me, but it may still be too low for many setups. Anyway, I only put 4 chords together in 8 minutes or so, you aren't missing much.