At least 68k version could be tested on OS4. I dont think real Amiga users matter there but it would give chance for MorphOS and WinUAE users to try.
As Cammy kindly pointed out, BOH is not just for AmigaOS and AROS, but it runs also on Linux, MacOS and Windows, so pretty much everydody should be able to try it. Also, maybe there's a chance it runs with OS4Emu on MorphOS - I've already asked a couple of times, but nobody ever reported anything.
I honestly didnt know about BOH until now...
That's surprising (but none of your fault, of course), because there are countless threads and news items on Amiga sites about BOH: just think that since the original release (~10 months ago) I've released also lots of other stuff (9 updates, 10 additional missions, 4 additional themes and 3 additional translations, to be precise), which has been presented to the community by means of press releases here, on AW.net and on Amigans.net (just to mention the "official" threads).
Well, since the game is new to you and to others here,
here is a quick way to have a glance at it: a little trailer I released yesterday