It's a bit off in some parts around the middle
Overall a good first into covering or remixing video game music, and Laughter is one that's seldom picked, even if at all.
From about 1:00 to 1:38 does sound a little screwed up, as you mentioned to me, but playing by ear and memory can sometimes be a testy issue especially when you have to listen for the fainter instruments.
To end this note with a little amusement, I quote the fanatic praying in Kadary's streets. "Oh, Zio, the holy one..."