Then English versions are really hard, especially version M. Honestly though the Japanese versions are quite beatable with practice. Pure memorizer (like every other game in the series) really. You just need to learn how to deal with every enemy and hazard in the game. The later loops are all about bat dodging skills and heart management.
The real difficult part is there are is 1 sure unavoidable hit. Also some of the animation is so poor that you get hit by invisible attacks (like Frankensteins chain). Also the collision detection is quite unfair on some enemies. Still though, you learn how to deal with it
Sadly the board is quite rare. English boards are typically $100-200 usually. JP boards (only ones worth owning) are very pricey. Currently Try has it listed for 42,000yen. (GFront wants 90,000yen
The PS2 port is playable. But it's got blurry filters you can't disable. Also has a few annoying emulation bugs sadly.