It wasn’t the lack of commits which made me think this was abandoned, but everything else (outdated instructions, issues and pull requests open with no reply, giant warning at the top of the README…).
If it were completed, the author should have closed/rejected every issue and pull request and removed this large warning at the top of the README:
> THIS PROJECT IS STILL IN EARLY DEVELOPMENT IT USES EXPERIMENTAL
CRYPTOGRAPHIC LIBRARIES AND IT HAS NOT HAD ANY KIND OF SECURITY
OR CRYPTOGRAPHY REVIEW THIS SOFTWARE MIGHT BE BROKEN AND UNSAFE
Plus, install instructions are outdated. As soon as I tried them, `go` complained of using a deprecated method.
So everything points to it no longer being under development.
Not much development can be done about experimental cryptography, you just use it and that's all. Cryptographic review can't be written either. Also you said you don't want much cryptography.
> Not much development can be done about experimental cryptography
That’s not the bit that matters, it’s the “this project is still in early development” and “this software might be broken”. Those are the things which hint at the project not being done.