Oh wow, I actually hadn’t heard of Boo until now — thanks for sharing it! Just took a quick look and yeah, I can definitely see some parallels. W++ wasn’t directly inspired by it, but I guess we both arrived at similar goals: a Python-style language that plays well with .NET.
This was by the same author as UnityScript, wasn't it? IIRC the latter was mostly just Boo in a JS trenchcoat, which is why both were supported along with C#.