Good balancing of currencies. Nice scaling - just allows tier-access without maxing out the former tier, and just valuable enough entries that sometimes it's worth going back and maxing out things you left behind. Great use of audio, best I've seen in the jam. Good tension throughout with the escalating costs and the slowly, SLOWLY diminishing threat level. The choice to never have auto-mineral gain was inspired. A clear endgoal without blatant progression steps from the beginning, so we know what we're doing, that there will be a win/lose condition, and still get the joy of discovery.
And I like that in the end I've got a bunch of monkeys on the internet. Because of course I'm not getting rid of the internet!
I'm only about halfway through the entries, but this is my Pick Of The Jam so far.