I think a game with a great character rooster, to introduce their Playtonic Universe Cast/ World´s would be a good choice.
But there would be many ways to do that.
I for myself would be happy, about a Fun Racer.
But that would also be possible in a Fun Beat´em Up.
Or even a Party Game!
Although, i would be most down to a Fun Racer.
One game, to introduce us in their new Universe and from there, they could go in Every direction they want.
I think, that would be pretty cool.
"Untwerwegs in Düsterburg" an great Adventure, full of sarcasm, humor and adventuring!