Thanks for your post. Googlyzer has not been tested on WP MS, but it has been tested and runs fine on a standard WP install.
The error you noted is a path error. Googlyzer looks for the settings html file in the base plugin path, it's standard path is:
Googlyzer gets BASE_URL from running the get_bloginfo('url') function. However, I believe get_bloginfo may return a sub-blog address on WP MS, and not the root URL.
Try editing the googlyzer.php file as follows:
Add this line at the top, just after the
// define constants comment on line 51:
define( 'BASE_URL', network_site_url() );
Then modify the line that defines GOOGLYZER_PLUGIN_DIR (was line 54) as follows:
define( 'GOOGLYZER_PLUGIN_DIR', BASE_URL .
'/' . PLUGINDIR . '/' . dirname( plugin_basename( __FILE__ ) ) . '/' );
Let me know if that resolves your error. If so, I'll incorporate the change into the next version.