It's been a while since I wrote one of these, and I'm not looking to lose my whole night to this, so we'll see how this goes.
Not in a bad way, and not that there is more than one previous example to draw from, but in short, it's a Princess Peach game. I'm a bit surprised they haven't done more of these between Super Princess Peach and this one, because like the first one, I found this to be pretty fun overall. It's at least fun in a cute, straight-forward, relatively simple way.
Similar to what I think I remember from Super Princess Peach, and unlike traditional Mario games, the focus isn't so much on the platforming or technical aspects, but more on giving Peach a gimmick and finding interesting ways to play with that.
In this game, that gimmick is that Peach has been tasked with saving a performance theater. Each level is a play, and you gain and use your powers based on being the lead in each play, in place of the original actor you are attempting to save along the way.
The variety of plays lead to a variety of characters, with drastically different powers and in a few cases, feeling like you're playing a completely different game from level to level. You might be playing a beat-em-up, and then decorating cakes, and then side-scrolling shooter to tracking down clues to solve a mystery.
The set pieces are fun; all built as stage plays, which gives an opportunity to play with ideas like flipping the scene around to "go inside", finding your way back or under stage, etc. Peach's costumes are great, and each fits the different characters she's playing well.
While the core game is pretty light and straight-forward, essentially walking from one side of the screen to the other, with pretty low risk of being defeated for probably anyone a bit more used to Mario platforming, this could make it a great entry game for younger players, or especially players who might find the variety of costumes and set pieces more interesting than jumping from platform to platform.
If you want to blast through the game, it will probably be pretty quick and come off pretty simple, but one of the game's strengths is the number of collectibles to find along the way. These really encourage you to search around, poke in different areas, find your way backstage, collecting Sparkle Gems, additional dresses for Peach and ribbons for her sidekick, and eventually some hide-and-seek friends on subsequent playthroughs of each level.
I just completed the game, having gone through and found all of these collectibles, with a bit of guidance here and there, but I don't know if I would recommend that level of play for everyone. It was relatively quick and easy to go back through and collect them all, especially looking some up here and there if I just couldn't quite figure it out, but some of the levels really just aren't as fun the second or third time through. Coupling this with not being able to speed up or skip dialog, and some of the final bits of collecting really did just feel like a slog.
I did think that the 2nd playthrough each to find the hide-and-seek friends was a good reason to at least see the levels again, try to look a little deeper while you're at it to get the Gems you can find or ones you know you missed, but that might be about it. From there, I'm not sure how much more replay this game would expect to have.
I do think it's worth a playthrough to enjoy the design and the more leisurely pace, and just see what Princess Peach is up to these days when she isn't being kidnapped by Bowser. Just temper any expectations for depth, and enjoy the ride for what it is.