Listening to them back to back ... the alterations took out most of the depth and power from the sound when trying to auto-tune the notes. That's the big reason they sound so different and the alteration is weak and unpleasant. Yes, it's a bit more cheery. A better test, but a lot more work, would be recording segments of the song both Major/Minor with the same rig.
I used to have to play that song in a bar band I was in in Colorado. good song. I kind of like the remix, it sounds interesting and I think it is a great way to have a conversation about how we 'think' and how we 'feel' and mix up the two.
That's not horrible; it's really nice...which is horrible.
I'm working in the other direction.
I've written a bunch of songs recently that just sound, well, too nice.
So, I'm changing the odd chord here & there to make them sound more dark, depressing & downright evil.