Probably a later revision compared to the one you had seen.
It plays relatively well for a beta version, although there are some random bugs and some of them are critical.
Some nice concepts and gameplay elements.
A finalized version would have been probably been a good game (perhaps not as great as the original HG but far better than the average game).
Btw, for whoever is interested I have what I suppose was the last released trailer, on Youtube:
[ Show youtube player ]