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That's a brilliant clue, I wish I had persevered!

I have solved the music room but I don't understand how I was supposed to guess that.

What I thought it would be (rot13):
gur abgr ng cbfvgvba a vf yrsg/zvq/evtug vs gur ahzore a oruvaq gur cvax wryyl svfu vf va gur yrsg/zvq/evtug cngpu

What it actually was (rot13):
gur ortvaavat bs "gjvaxyr gjvaxyr yvggyr fgne". jurer jnf gur uvag sbe gung? gurer vf ab oyvaxvat fgne naljurer V fnj.

I've rebuilt the game from a Windows machine, that fixed the splash bug for me. Did it dix the crash bug for you as well?

Thanks for reporting the issue. Which version of Windows are you using? I just tried on Windows 10 and, well, it doesn't exactly crash, but it seems to be stuck forever on the splash screen. Hopefully those are two different symptoms for the same issue, I will tell you once I fix the one I can reproduce.