I published BOH in 2009, and in the (more than) 10 years that passed since then, I released 19 free updates, because I just couldn't resist making it better and bettter. The physical edition I produced in 2018 was supposed to close the game's development cycle, but I felt that I just had to backport to BOH the video system features/improvements that I came up with for Blastaway. The result is that now I have made the 20th update available (again for free, of course)!
* Simplified and optimized CRT pixel modes.
* Made 4x LCD pixel mode slightly brighter.
* Added 6x pixel modes.
* Added hardware-accelerated zooming for solid pixel modes to AmigaOS version.
* Added Italian brief to mission "Faces".
* Made a few minor fixes.
* Updated manual.
BOH page: https://www.retream.com/BOH
Trailer: https://www.youtube.com/watch?v=1j39yyZKJo0 (very old, so it doesn't show all the improvements that happened since it was made, but instead of spending time on making another trailer, I prefer making more games!)
Gameplay video: https://www.youtube.com/watch?v=snpKPbTzSpA (more recent, but still it misses something)
To update an installed copy of BOH, simply install the new version over the old installation by means of the supplied installer.
Even more good news for the owners of the physical edition: due to the very limited production runs, the CDs were duplicated (i.e. burned), not replicated (i.e. glass mastered), and the factory was asked to leave the CDs open to make them updateable in case of future updates! The CDs can updated by burning a new session/track that contains the files included in the new CD ISO image.
*** WARNING ***
Updating a CD is a delicate process that might damage the CD, so it is necessary to have specific skills and tools. If you are not completely sure, do not attempt the update. IN ANY CASE, UPDATE AT YOUR OWN RISK.