Here are the three attempts it did least sucky with, imo, if you're curious:
https://g.co/doodle/4t8m9b <-- the best it did
To hear a nice simple piano rendering of Bach's actual harmony, play the audio recording on this page, which I found among many options at the "audio" tab of this chart on a page for the hymn on a site that looks really cool, Hymnary.org.
I know it's sorta gruesome, the bloody head, the wounds. But it's glorious. And I love some of the words. Couplets. Notions. Mostly, though, the tensions of the harmonies and the wonderful running lines.