This game was a blast, I bought it years ago, and while it's not super great to the deep extent of Planet Robobot, it's still a great platformer to play, if not complete. A charming romp through Dream Land and beyond as Kirby tries to stop a cult? Sign me up! But did I mention this game is sorta dark? From the premise alone one could think many things… The music, as with any kirby game, is excellent, and the post-game content is great too! Even better with the Dream Friend updates. Overall, I think that alongside Planet Robobot, this is a great starting point for the Kirby series. Go check it out!

I think Star Allies is a fantastic game but it’s not something I can really recommend, it’s very much a “you had to be there” game.
The game is very much fanservice for all of Kirby up until this game but especially the Dark Matter trilogy (DL2, DL3, 64). If you don’t have an attachment to those games, you won’t get much out of this game. But also, if you’re new to Kirby and want to play this one, you almost definitely don’t have the same emotional attachment and won’t get much out of it. (…and/or you’ve probably been spoiled already.)
Gameplay wise, the main story is lot easier than usual to make up for the 4-player aspect. But it’s a little too 4-player friendly and ends up being ridiculously easy. Guest Star and Heroes in Another Dimension are fun.
Being a continuation of a set of Kirby games that’ve slowly been getting a worse reputation over the years for their flaws, easier than usual main game, and people expecting the game to be more like Super Star because of the helper system all work against this game. It was a FANTASTIC anniversary celebration, but that’s exactly why I can’t necessarily recommend it.