Endless sky is really fun, and might scratch the same minmax itch as thrive.
Endless Sky is a 2D space trading and combat game similar to the classic Escape Velocity series. Explore other star systems. Earn money by trading, carrying passengers, or completing missions. Use your earnings to buy a better ship or to upgrade the weapons and engines on your current one. Blow up pirates. Take sides in a civil war. Or leave human space behind and hope to find friendly aliens whose culture is more civilized than your own.
One of my favourite games out there - not just open source ones specifically, but like all games included.
If your goal was a boring and bland post, I gotta say you screwed that up pretty bad. Please keep us updated on the cheap knives quest!