The recent releases of the NES MINI and the SNES MINI proove what homebrew and emulation fans always knew and that is the old classics still play great today, heres a new rom hack released of a Castlevania game, heres the info:

A new Castlevania adventure is available to play for NES!
Simon Belmont has just defeated Dracula, but now faces a new enemy. Choose from 5 different stages before facing an evil necromancer in the game’s final stage. Make sure to use the power of the holy relics as you complete each stage!
Featuring all new weapons, bosses, enemies, and gampeplay, Castlevania: The Holy Relics is a rom hack done by Optomon throughout the course of 2017, with graphical contributions by Setz, Bit-Blade, Dr. Mario and Boneless Ivar. Version 1.0 will be up shortly!

via http://www.romhacking.net/forum/index.php?topic=25384

download - http://optovania.com/dsk/mod_the_holy_relics.html