All of the PC-98 games are much easier than any of the Windows games.
-HRtP gives you about 20 extends, plus one bomb for every time you die, and you can mostly bypass the stages (and gain extends (which later turn into bombs)) by bombing. Learn which attacks send the ying-yang bouncing in fixed angles, and SPAM MOAR OFUDAS; the gohei swing is rather unwieldy, extremely situational and mostly useless.
-SoEW is full of cheap deaths. Then you play it again and you don't die to the cheap stuff which now you know it's coming (you DO know it's coming, right? you aren't a freakin' goldfish), and you beat it because it's stupid easy when you know where the cheap stuff so you don't have an excuse to fail to bomb before it's in your facebox.
-PoDD is basically a pattern recognition game, sure, there are tons of patterns, but once you learn how to dodge the (mostly streamed) attacks it's just a matter of not picking a bottom-tier character (why do so many people think Kana is anything but complete rubbish?) and having a bit of luck vs. Yumemi who will sometimes survive for eight minutes
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-MS is about as hard as the easiest Windows games, except that the difficulty is all concentrated on some parts of the Yumeko fight so you can just bomb bomb bomb bomb bomb yumeko and mostly avoid all the hard parts without much trouble. It's also the best game in the series, this is completely nonsubjective, honest, also I wonder if someone ever died to sara, what was ZUN thinking, dudette shoots upwards, some gatekeeper