This.
Not difficult. You probably won't even die.
But this thing ricochets around that little platform, and any time it nudges you or slithers away just in time to make you harmlessly strike its yellow shell, KAPEW you're gone in a flash and you have to make the trek back up. Again, and again.
I know going off the edge just makes you go to the previous floor, only a short distance from the staircase back up... but I think that hole in the middle leads straight to the
first floor? And oh, after falling... the hit counter resets.
Oh the tedium... For some I'm sure it isn't hard at all to aim just right the first try, but for unskilled gamers
(me) this thing is the worst. Luckily the second time fighting it at the endgame isn't hard at all (especially with an upgraded sword).