Might have to give the PS4 Haunted Castle a whirl; I hope it emulates better than on the PS2 release. Anyone know the price so I know what kinda card to buy?
Edit: Turns out I still had currency in my Japanese PSN account, so I signed in with my PS4 and got the game with little fuss (besides trying to remember my password). Seems to emulate the game very nicely as it's part of the Arcade Archives series, and I was able to tinker around in the menu a bit to turn off pixel softening and stretch the image horizontally a bit (the default is completely square pixels, which makes for a funny aspect ratio).
I don't know what any of the game config options do and I didn't mess around with them, but you seem to have unlimited continues; normally in a ROM played on MAME, you can rack up about three or four continues, and they just add extra bars to your life meter, but once that's out, it's game over, start anew; however, in this PS4 version, once that's run out, you're brought to a PS4-specific game over screen which says "Press Option button to continue or Jump button to quit" or something like that, and I was able to continue indefinitely, it would seem—I would just have to start at the beginning of whatever stage I was on. So that's cool AND I MAY FINALLY BE ABLE TO BEAT THIS GAME BECAUSE OF IT.