What bugs me about the whole "Batman: In Space" setting isn't that it's bizarre, but that they're going for novelty, not actual development. Lego Batman 2, while it used a lot of the same formula, at least had new development with the open world hub.
With this, the space setting just seems like a desperate grapple at novelty and excitement, without the meat of any development. It reminds me of something I'd play in a dream, where Batman is in space because it's cool, but there really isn't rhyme or reason to it.
If they are going to use the same formula, at least do something interesting with it. Make a game using classic Lego themes or something. The idea of batman in space is admittance kinda cool, but making a whole Batman in Space game is just desperate.