Yeah being able to do SDL with low pain was something I verified before deciding to do this.
As for SIMD, it seems as with most languages that are not C or C++ the answer is 'kinda'. Nim has a pretty good experience for SIMD since the C bindings are easy and zero cost, and you can metaprogram since nice stuff:
https://github.com/jackmott/nim_simd
Rust had some good works in progress for pleasant SIMD support so that will probably end up in a good place. Microsoft has a nice plan for simd intrinsics in .net as well. Maybe some day!
I do plan to do a SIMD perlin noise lesson at some point, if Go can't do it in a reasonable fashion there will just be a couple day of C!
Dynamic linking is possible since Go 1.5