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