Sorry it's still being crashy on macOS everyone :(
Thanks for posting those attempts at running it bytesoup. Found a bug/issue post for libgdx (engine that MewnBase uses) that sounds like it might be the same issue: https://github.com/libgdx/libgdx/issues/5205
Although I'm not able to test this on my end... the post suggests trying to disable the dedicated/integrated gpu switching on your system (probably like this http://osxdaily.com/2017/01/08/disable-gpu-switching-macbook-pro/) - and then running the game again. Would you mind trying that out and letting me know if it fares any better?