Last time I tried Maria+ Castlevania Portrait of Ruin romhack, well this was very nice expierience to fight with your supporting cat Byakko, that's how the story should be and the protagonists.
After that I went for more and tried Maria of Sorrow. All that GBA backgorund tricks, like blinking moon, animated clouds and sky like kind of fractal, and all that level design and backgrounds and soundtrack. Using rotating GBA hardware capability in clock tower or rotating sickles. It's an awesome game I would say even better than ds counterpart and now with Maria Renard as main hero. Nice.
as for comparision recent castlevania fanmade game for amiga
The Legend of Zelda: Ancient Dungeon is a completely new way to play the original The Legend of Zelda on NES. This romhack makes The Legend of Zelda play like a roguelike. Venture through a randomized, ever-changing dungeon with progressive difficulty the further you go. Collect classic items and upgrades, and battle familiar foes throughout your journey. Every playthrough is different. Ganon is lurking deep within the dungeon, but beware, for if you perish, you’ll have to start all over from the beginning. Are you up to the challenge?