The NES library has quite a few rare games, and this is one of them. Snow Brothers looks and plays very similarly to Bubble Bobble, which is one of the reasons I wanted to play it. It was originally released in arcades in 1986 and the NES port didn’t come out until 5 years later. What I find strange is that this game was apparently also released on the Genesis, but a quick search on ebay shows nothing while there seem to be plenty of NES copies floating around.
Snow Brothers for the NES was developed by Sol and published by Capcom in 1991.