Castlevania has taken many forms throughout its long history, and it returns once again in this fan made game that essentially remakes the original Castlevania for NES and gives it an original Doom first-person makeover.
The mod in question is called Castlevania: Simon's Quest which was created by developer Batandy and is currently available for free to download on itch.io. The game drops you into a first-person perspective, and has you battling all of the nightmarish creators found in Konami's original Castlevania. Here you'll whip killer skeletons, creepy bats, and basically every candle you can find.
The mod also features several difficulty options, but be warned, in traditional Castlevania fashion, one wrong move can deplete your health incredibly fast, and the ever elusive health regening pork chops are few and far between. Good luck!
Mod download - https://batandy.itch.io/simonsdestiny