A soulless, lifeless, monotonous, bland, generic 2D platformer. If you're looking for a 2D game to play, play Hollow Knight. Play Donkey Kong Tropical Freeze. Play Super Mario Maker. Play Sonic Mania. Heck, play New Super Mario Bros. U Deluxe. Just play anything besides this, the game Nintendo thought would be a chance to make Chibi Robo a hit.
Like Scott "Will Eventually Take a Look at the First Mega Man" Wozniak once said: This game blows.