This app was mentioned in 10 comments, with an average of 1.70 upvotes
Space Trader was an old Palm game. There's another port of it here with nicer ui. Both are open source if you want to make your own additions.
Space Trader - it's a simple, but challenging game. Also it's FOSS - no ads, no in app purchases, open source.
It's turn-based
Since you mentioned video games:
This one is an Android port of the classic PalmOS RPG: https://play.google.com/store/apps/details?id=com.brucelet.spacetrader
I spent many an hour... ok, many a day... wiling away my time playing this space trading game.
There's also this Space Trader, which I think is a better implementation, but your mileage may vary.
Interesting
Reminds me of https://play.google.com/store/apps/details?id=com.brucelet.spacetrader
Have an Android phone? you're welcome
There's the other space trader port with some improvements like higher resolution graphics, more themes and bug fixes:
https://play.google.com/store/apps/details?id=com.brucelet.spacetrader&hl=en
Star traders RPG:
https://play.google.com/store/apps/details?id=com.corytrese.games.startraders&hl=en
A pirate themed trading game with similar mechanics:
https://play.google.com/store/apps/details?id=com.micabyte.android.pirates&hl=en
Space Trader - 4.1 rating - Free - Search manually
Traffix - 4.5 rating - $0.99 - Search manually
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Legitimately just 'space trader'. Here's a port for Android!