This has been teased a few times over the years. first by Nekofan a long time ago, then more recently by Jun Amanai who programmed that port and apparently own some versions of it. Comparing the version I obtained with Jun's, it seems that Jun's version is more recent and complete. This PC Engine build here seems to be a work-in-progress debug version, where you can skip levels at the press of a button, and not all features have been implemented. Still a cool thing! The files are below.
To see more from the actual article please check out -SMS Power Forums
Stay tuned for more info as we hear more! ~