Thanks for your kind words. The musics are real time synthesized modules, which originated back on the Commodore Amiga, yes. I'm advancing slowly, but I intend to replace those scores by my own at some point.
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I'm using Sunvox library, and I was able to play some XM and MOD for testing purpose. As for the rest, I'm still discovering how it works, as each aspect of making a small game like that is an endless pit of very peaky knowledge 😅