There's a patch around the forum that allows you to use MyISAM in OpenGoo. Search for "non innodb patch". We added for next release the option to choose the MyISAM engine in your installation, so that if your hosting doesn't support InnoDB you can still use OpenGoo.
However, MyISAM is not more robust than InnoDB, but the other way around. InnoDB supports transactions and MyISAM does not, so using MyISAM with OpenGoo could leave you OpenGoo inconsistent. MyISAM though is supposed to be quicker than InnoDB and is more common in hosting providers.