FYI: The code is out there, but AFAICT, the language is not open source. No declared license exists anywhere. So you can't actually use this.
what does that legally mean, if a project on github share the source publicly, but doesnt state the license, is there like a defacto or default license that applies then
You may look at it, but you may not reproduce it elsewhere or create derivative works (except where covered by exceptions).