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I'm not positive I understand your report, but I think you're saying that one of the planets you landed on had the harder enemies wandering around to start with? This is as designed, sometimes there are groups of weaker enemies, and sometimes there are the harder enemies, but fewer of them.

No, no. Every wanderer enemy in every planet after my second new game was a boss. Normal enemys only spawned from the caves.

I see... I think you just got (un)lucky :) It is random, so it's possible it might happen sometimes.