Why kids are playing it.
Most kids don't seek out Astro's Playroom — it is just there when the PS5 turns on, brightly colored, bouncy, and immediately responsive in a way that pulls them in. Once they're in, the controller does a lot of the work. Every step the little robot takes sends some kind of buzz back through the DualSense, and that's a thing kids notice almost immediately.
What seems to keep them playing is that the game treats every small thing — bouncing on a button, climbing a wall, sliding down a tube — as if it matters. There's nothing to grind for, no levels to outrank, no other players to keep up with. They are exploring a small, friendly world. For a kid who has only ever watched Roblox or Fortnite over an older sibling's shoulder, the calmness of it can be a relief.
What parents should know.
This is not a game you need to monitor in any meaningful sense. There is no chat, no other players, no purchases, and no way for the game to surprise you with new content or new strangers. The only adult input that matters is at the very front end, when a kid is figuring out the controller for the first time.
On that — the temptation as a parent is to walk a young kid through every input. The thing worth remembering with games is that letting a kid hit buttons and see what happens is usually faster than narrating it. They lose nothing when they fail. The character respawns at a checkpoint that's basically right where they were. Figuring it out is the whole loop, and they're allowed to do it without a parent breathing over their shoulder.
What does take adult attention: it's a single-player game. With more than one kid, you'll have to manage the turn-taking, because the game won't help you with that.
Gameplay observations.
The structure is four small worlds tied to parts of the PS5 — the SSD, the cooling system, and so on — a thing the kids do not care about and adults find weirdly charming. Each world is a short series of platforming stages where Astro picks up a temporary suit (a frog suit that punches, a spring suit that bounces) that defines that level's puzzles. Then it ends. There is no long campaign and no save-and-quit anxiety. A kid can play for fifteen minutes and feel like they did a whole thing.
Death is forgiving in a way that matters with younger kids. Astro respawns near where he died, almost always within a few seconds. There's no lives counter, no game-over screen, no penalty for trying something risky. That removes most of the small frustrations that make a four- or five-year-old hand the controller back.
There is one place it can get mildly tense: the boss fights at the end of each world. The bosses are big and silly more than scary, but they do involve patterns the kid has to read. Younger kids may want a parent to take over there, and that's a fine moment to do it.