I apology for my mistake in making the Official site Support Email form, where there is no blank column to fill in the sender name. For the person who just sent me email regarding this game, please check my message here: (I'm sorry I can't send the reply as I don't know your email)
https://steamcommunity.com/app/924780/discussions/0/2763442118821139899/
Or feel free to reuse the support email form, as I've fixed it now. Thank you.