Your question echoes a number of other similar cases. It depends on a number of factors, not least jurisdiction. In UK law, the rights would be sold off as with any other asset, probably by a corrupt and mismanaged "receiver" who won't give a ****. The fact that the game has a place waiting for it on Steam should help to raise the value of the asset, and receivers are duty bound to make efforts to achieve the best value for assets of a company in their charge, but really they're just fronts for the bankers who caused the debts in the first place, and often undersell the goods so as to provide bargains for other companies.

There is another company that released A-Train 8 on Steam, Degica, so maybe they'll pick it up? They did mention releasing other games in the series...