it should automatically be vertical on mobile, so this issue is really weird. i don't have a fix for it yet but someone else who had this problem said it went away when they used a browser that wasn't chrome. sorry for the inconvenience!
Yeah, switching the browser helped! Thank you. Now on to actually check the game out! (I've played a bit and I'm super torn between the discomfort of being a cop and a joy of doing detective thingies :D )
Also a thing: apparently, forcing my phone to lock screen into vertical also made things look like they are supposed to in Chrome. So idk if it'll help you with looking into it or give any inkling of what could be the reason.