I really hope that they decide to continue the game is pretty good so i hope that the game sells well
Rem answer on steam that they will take a long break to spend time with their family until New Year. After that he and Sachima (the artist) will discuss about their plan moving forward. Nothing is promised now but at the end of January is probably the earliest we would hear anything from them again, regarding to dlc and such.
"Sachinama and I are going to take a break and rest until after New Years to spend time with our families, and then we're going to discuss our options together afterwards. So until we have that discussion, there's no plans yet. " a direct quote from Rem
However, the game is look like going strong and profitable for them. It sold almost 10,000 units on DLsite within a day. I think the amount of sales on steam is good enough. It was on top 5 global best selling for a short period of time and the review count on steam is looking good.
I can feel on how Rem answers that he quiet relieve on his anxiety about the game sales. He's not sound really skeptical anymore. Moreover, they even announce their plan to translate the game into Chinese on their Ci-en. (if my shitty Japanese does not fail me lol)