Hi there,
Welcome to MCO! If you found the demo interesting, I am sure you will find the latest version even more compelling- its far more advanced both in code/gameplay and graphically... as profit noted, send Hyper a personal message on these forums, asking if you could join in with testing the latest version (beta still).
We test every week/fortnight or so, server runs 24hrs a day over 3-4 days. So theres allways plenty too do.. also if I am correct in saying, I think a test is scheduled for this weekend ( 19th march onward) so all going well maybe we can meet you on the surface soon!