Thankyou for playing! Yes i would definitely change the controls after jam. When i joined the jam, i was already a day late. i was implementing sound and instructions in the last hour. i wanted to add some BGM but i wasnt sure what kind of music would fit well with the game, i would love to hear any suggestion regarding BGM.
For BGM, I would check out other games similar to yours. You'll find quite a few right here on Itch. Then just look at their music credits. I've found decent music for my games doing this.
You could also try finding game music communities and asking them. There's one on reddit, for example. Just be careful to read their rules before posting.