hello, regarding to the wiki, you can install mono
with sudo eopkg it mono
, in the case of openal
, it seems that the name of the package change a bit, I guess it's openal-soft-devel
you can install it the same way as you installed mono. And now the question remains, I don't play it so, the best I can say is you to try it out or wait to someone that already tried or is playing it.