"Squirrel is a high level imperative, object-oriented programming language, designed to be a light-weight scripting language that fits in the size, memory bandwidth, and real-time requirements of applications like video games."

could tell you it's smaller than ruby/python/php, and designed to be OO compared to Lua or others. There is also a list of features, I don't think the authors of the page should have a list of "we are better than X" for every value of X.