Not that it's not amazing, but can't i'm pretty sure most languages can do that same thing.
If it does than I would disagree - not many other native languages can do that - having a native language with a sane build system, package management and proper modules would be a huge deal on it's own.
You might want to add a CC0 license to the project (or something else, but that's usually what I see recommended for "sample code").
[ed: and:
ldd ./target/release/hello_gtk |wc -l
59
]