If nothing else, Christopher Winterbaeur’s charming (if misleadingly named) “Moonshot” proves that even the most cliched rom-com tropes on Earth can feel kinda new again if you re-stage them on Mars. Or, for that matter, on a ritzy passenger rocket ship as it makes the 35-day trip from the East Coast to the Red Planet in the year 2049. That’s where most of this modest but well-realized HBO Max original takes place, as its star-crossed tale about a rich girl named Sophie (Lana Condor) and penniless stowaway Walt (Cole Sprouse), who sneaks into her heart, as they’re largely confined to a cabin they’re forced to share for 55 million miles.
She’s a studious astrophysics major whose very long-distance boyfriend (Mason…