You might want to consider changing the included emulator for PC, it appears to have input lag and rendering issues.
I did a new emulator config with another way for remapping commands (native emulator mapping is Right Ctrl for fire button and something else non-standard, that's why I did the remap which may cause lag). Try downloading again, it might be improved in that area with the changed config file. It's on CastlevaniaAGA_Win64\FS-UAE\Configurations\Default.fs-uae so you can edit and alter mapping if you use a controller and want other button maps etc.
About Genesis, I was told (by contact working for the IP holders) that, as long as it's on a niche system like Amiga, I'll be fine. If it goes to modern PC or even the popular Genesis, there could be legal scrutiny. New Genesis games are made into cartridges by the Chinese to be sold by the thousands at AliExpress, so, money involved = big problem. But, I could do a Genesis game with original IP using this codebase or parts. ;)
> But, I could do a Genesis game with original IP using this codebase or parts. ;)
I'm interested in this.
But, well, Konami isn't TOO strict... There's odd cases, like that one guy in Canada who sells his fangame remakes and claims to have Konami's permission to do so, or the case of the Castlevania Unreal remake that got hit with C&D (though Konami later lifted it to allow the dev to update it as long as he doesn't add content), overall they don't mind fangames.