DuckTales: Remastered is a re-make of the original 1989 NES game that was released back in 2013. Anyone who was a fan of the original would have loved it, but now, sadly, it's being removed from sale from digital platforms such as Steam.
A similar thing happened to another Disney licensed re-make, Castle of Illusion Starring Mickey Mouse, although that game was developed by SEGA rather than Capcom. While there's no word on the reason for the pulling, it's possible much like Castle of Illusion that it's a rights issue with Disney, and more importantly, means the game may make a return one day.
But for now, treat it like your last chance to grab the game, as tomorrow, it will be removed from sale.
The good news is that if you did want to grab it, it's been heavily discounted to just $4 for the remainder of it's time online.
If you have a copy of the game already, or a physical retail copy, then you'll till be able to enjoy the games after it is removed from the stores, but new customers won't be able to purchase it.