It shouldn't take very long to re-compile it for MorphOS, if you need any assistance send me a PM and I'll put you in touch with the proper people.
I think there are probably more active MorphOS users than there are OS4* too so it's a bigger market, or perhaps they have about equal number of users. Either way it will at least double your amount of potential customers at the very minimum when you combine both markets together.
...
*No sales figures available for OS4 but most AmigaONE/Teron motherboards have unfortunately died by now due to old age and bad build quality, that leaves the X1000 with "more than 200" owners, the unknown number of ACube SAM boards, and the Pegasos II which is a MorphOS machine that just happens to run OS4 too. I really don't want to start another "holy war" here, I'm just trying to put potential market figures out there for you to consider whether it's worth your time and money to port to MorphOS.
End of sales pitch/begging effort. 
My A1-XE is still running very well, thank you, and I'm aware that there are way more than 200 X1000 users.
And you can put me down for one more Sam board. I'd be happy to buy at least 3 copies of this game...
