Okay, thank you!
Yes, I'm playing on Windows. I don't know about mobile devices, but yeah, I guess me having a computer bought in Spain and set to spanish makes the game to start in the same language as the device, by default.
I may wait for the updated demo before playing. The language thing, okay, I could do with it since I understand spanish, obviously - and it would be only for the intro anyway. But the stretched image really bothers me.
Anyway, thank you for your quick answer! I'll stay tuned for updates!