Just one more reply, I got it to work by downloading the "screen height resolution < 768" version, this one actually starts on the correct screen! Just for reference my screen size is 1360x768 so that might be it. I just didn't see this version before because I was using the Itch app and it apparently doesn't show the multiple versions.
Also there seems to be a bug with the Itch app where (at least for me) the code booklet image doesn't show up in the game description page, which I think is really strange since the other images appear fine. So I'll file a bug on the Itch app for that I guess.
But at least it works now! So thank you!