https://www.gamespot.com/articles/kirby-star-allies-review-roundup/1100-6457395/

This week marks the launch of Kirby Star Allies, the pink puffball's debut adventure on Switch and Nintendo's big marquee release of March. Much like other installments in the long-running series, Star Allies is a side-scrolling platformer featuring a variety of colorful stages and bosses, which players must overcome using Kirby's signature Copy powers.

That isn't the only trick in Kirby's repertoire this time, however. Star Allies also introduces the ability to throw hearts at enemies, which allows Kirby to befriend up to three of them (who can be controlled either by the AI or other players) to work alongside him in each stage.