okay, so ! I did a bit of research and tweaking in the property panel--I don't know if it's a compatibility error, but I had to go in the emulation settings and deactivate hybrid execution mode (? Not sure if it's the english name for that)
So, no idea what it means, what was the matter or even what is a virtual machine, but the game works ! (for now, at least. Although, I can't seem to find the settings menu in the game--was it removed, or is it just a side-effect ?)
Anyway, excited to see what's new !