Here comes SDL Master of Orion game engine recreation, called 1oom, cross-compiled to atari platform. Works in MiNT and TOS, it just needs pbx files from original game which is for example available on gog.com ( for 6$ for MoM 1 and 2 ) and this is the version I have tested it with. Just drop the prg to the folder with pbx and it should work.
Performance wise, it plays just great on my CT63@97MHz.
In addition, there is a command line user interface :) ( I guess this one should work without CT6x ;) )
Source code attached.
Link to the original 1oom website