TBFH I feel like Amanita is in a position in which their games do not need take a spot in the advent calendar. I very much doubt Yet Another Whimsical Flash Game (hopefully they switched to Unity by now, but Samorost 3 was still Air goodness gracious!) is going to make new believers.
That’s not too unlike giving a prize to one of those franchises releasing on a yearly schedule, IMO.
So, save them a spot on a corollary, expanded, end-of-year list while keeping the prime spots for something more fresh and deserving, would be my inclination.