Turns out I only had a few levels left before the end boss, and they weren’t all that difficult. Neither was the end boss actually, as I defeated him without dying. I was surprised he only took one hit, but never mind.
Of course, it then turns out that he wasn’t the end boss. There were more levels. And a sad thing happens with Blob. Then! An AWESOME thing happens with Blob, and you get to “lay the smack down” (as the common yoof is want to say) on the black blobs. So I did!
And then it was the real end boss. He was a little harder (taking three hits, not one), but he was probably the easiest boss in the whole game.
After that, it was the end sequence. Which, tying in with the rest of the game, was stunningly beautiful. What an excellent game. Lets hope we don’t have to wait another 15 years for another sequel, yes?