This extension is asking me to write two clang commands (through a very basic UI) to compare their output and requires clicking and waiting to see changes instead of running on every keystroke, so it's not quite like Compiler Explorer. It seems that you started out interested in exploring LLVM's Intermediate Representation and different clang options. If you made the extension require no configuration (c_cpp_properties.json will already contain all the information needed to compile my code) and it ran on every keystroke, I think that's what people want. An extension for C programmers to quickly see what their C code actually becomes.
Also, there is no need to put "VSCode" in the name of a VS Code extension.