sorry for not getting back to you sooner. You’re free to use whatever music you want as long as it’s free but if you get into trouble for posting the game somewhere and not having the rights to the music then you’re solely responsible so it’s probably best to use music that you have the rights to use.
Sorry, I usually give feedback on all the games after playing them but didn't have the chance this time. Overall I think it was good and you had an interesting way of implementing the theme but there were definitely some things that could be improved as well. I think the fire rate is a bit too slow which makes it impossible to kill some of the zombies and I think you could make it a little more obvious when the player takes damage but overall pretty good. Congrats on finishing the game :) Also, congrats on winning the Jam. Have you already joined the community discord? If you have then let me know what your username is over there so we can get you your $10 CAD prize for first place. If you haven't then make sure to join and you will get the "Tazmen Jam Winner" discord role as well as the $10 CAD cash prize. The discord link can be found on the jam page :)