This is more of a recommendation than a suggestion, but I feel like it would be a welcome one -
Two programs that you might want to use is "Bosca Ceoil" and "Pixel Studio for pixel art" (yes those are the names); Bosca is for music and is a free download (it's kinda limited, but multiple tracks and audacity will prolly help with that) and the link is here: https://terrycavanagh.itch.io/bosca-ceoil and another link for it (non-itch) is here: https://boscaceoil.net/ (the non-itch may work better for now, it seems like it's a bit buggy - but I have the non-itch and it works fine for me)
and Pixel Studio for pixel art is on the apple store and steam - I can't share/find the links, but if you search it up fully it should be the one (it's for pixel art and it's really good and there is multiple ways to export it - it's free to play, but using it free has been fine with me, some tools are locked (but barely ANY) and there is ads on the free app version, but only when you are saving a project, so it's really good in my opinion).
Hopefully you can easily use these two programs for your game, I have to say they are on my "must-haves" for any thing game-making related.