It is very much based on BECMI/RC with some slight tweaks. I would say that this is very compatible with most if not all modules aimed at OD&D.
Not only that, but this game has been supported in Spain with a Codex that serves fan creations alongside canon (defining them as such) and we are definitely looking at setting up an English version.
(Spanish codex can be found here: http://codexdelamarca.com/)