Transylvania Castle by Fitosoft was released initailly in 2022 in spanish. It's a RPG game for Amstrad CPC. A new release is out (v1.3) with english support. Here is the description by the author :
The inhabitants of Transylvania are very concerned about a strange plague that has been ravaging this region for some time and killing many of its inhabitants. They think the origin of this plague is related to Count Dracula, a strange being who lives in a castle near the town, from which no one has ever returned.
To solve this enigma and end this plague, they have hired a professor specializing in "rare cases", Professor Van Helsin. Unfortunately, the carriage in which our brave professor was traveling on the way to the castle, the supposed origin of this disease, has suffered an accident, and when he woke up, he found some strange marks on his neck, an unequivocal sign that he has also contracted this terrible evil.
So in this adventure, you play the famous professor, and your mission will be to end this terrible curse, but you must hurry, since you only have three days before the curse ends your life…
The first step will be to go through all the rooms of the castle until you find Count Dracula and end his life, only then will you be able to end this evil. Finally, you must find the key that allows you to escape from the castle, since after entering it, the heavy door has closed in your path and only with this key will you be able to open it.