Also if the author wanted he could simply add in some cheap d10s that each player could use to keep track of their current planet values.
Perhaps a graduated stick, like a long cocktail stick/drink stirrer, for each player, you pull the stick across a line (eg from under the box) to indicate the score. Another way would be to have a stack of counters, like tiddlywinks, you could upsell different counter sets then (half marbles, cut stones, metal, different designs). Counters might work for tie-ins - planets of the Starfleet federation, planets named for houses of GoT or such. Or yes d10's as a sibling comment mentions.
Doesn't mean you couldn't have an app too, but then why not simulate the dice, etc., if you're going to need an app to play the game?