That is a very strange situation, the music is in the itch.io download but without the rights to distribute it?
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I'm sorry your video got a content id claim. I will add a note to the description so others are aware, and try find a better source for music for future versions.
The license allows me to include the music in videos/games, but not to host the files on my own site for people to download, which is why it's missing from the github repo.
hi Sebastian,
i‘m a musician and music producer from Germany, currently studying computer science in vienna and I would love to write and produce you some game music for your new airplane-game. I love since your first YouTube video. I would love to do this for free.
Pls contact me via mail: dominik.englert1996@googlemail.com
if you are interested :)
Greetings!
Dominik