So is there, like, a winning condition here?

Fifteen points!

Well, he is more interested in doing interesting zero-gravity things than optimally collecting points. For example if he briefly grabs the edge of this hoop after passing through it to get a bit of spin and then curls up and spins more. That is anti-helpful to keeping track of your orientation.

Well then she will just scoop up her fifth point while he does that.

He does not ca— okay he cares a little bit! He will endeavor to score points with style. Or hilarious flailing. Whichever is achievable.

Eventually he has fifteen to her thirteen. She claps.

“That was fun.”

He idly tries to find out just how hard it is to swim through air.

Pretty hard.

"You wanna play with zero g some more or go do something else?"

“What something else would you recommend?”

"Spacewalk?"

“—congratulations, you have found limits to my adventurousness. For today.”

"Okay. We can revisit that. There's more zero-g games if you want or we can go back planetside and catch a music festival or whatever you like."

“I think I actually want something quieter!

“—Castle?”

"Castle it is!"

And they can deelevate down to Mars and zoom to her castle, which is pretty and veined in gold and quartz through the stones.

The details of the blocks are far subordinate to: castle.

It's a beautifully architected castle! They can circuit the outside before they go in.

Does it have a moat and arrow slits and murder holes?

It does! All of those! Although presumably the latter two are skeumorphic.

Oh come on, surely you can have a mock battle.

"Not in my house! I live here! If you like that kinda thing there's sets for it."

“I like seeing things put to their proper use!”

"I mean, I do have bows somewhere if you care to be shot at from the arrow slits."

“Didn't I just say that I was feeling less adventurous for now?”

"It might have been more appealing than the spacewalk! Do you wanna play with lightsabers instead? They're safe."

“Well, what I thought I wanted was a tour of gratuitously fantastical-or-historic architecture followed by finding a quiet spot somewhere within that to think, but let's do that first!”