Yeah, sadly it doesn't work right now. The message I get is this-
“PNGTuberPlus” can’t be opened because Apple cannot check it for malicious software.
This software needs to be updated. Contact the developer for more information.
I don't know anything about programming or anything so I'm not sure how to help, but if you ever do end up getting it figured out for Mac, I will absolutely be using this, it looks so awesome!