Name change seems perfectly fine to me. Helps remove some of that probable confusion in search results that it was causing before while making more of an identity for itself. Tho, to be fair, I had no idea [In Heat] was the "subtitle" for that game. Since, they don't seem to advertise or print (at a cursory glance) the "Lustful Nights" part anywhere. I never had an issue confusing the games, as I play both of them.
As for the break, I'm sure I can speak for everyone when saying, do what is needed for yourself. Working on something without the right attitude and mentality for it, just causes problems that need to be fixed later. "Measure twice, cut once" and all that.