The archmage was a bit disappointing. I just hit him for 3600 damage and he died. Maybe larger battlefield and lots of minions will be more challenging.
Trading is not balanced. I've made 1 million bucks in 20 minutes. I got 2 stations with 0.7 and 1.8 multiplier in one system which trade the same goods. So single run between them with full cargo load yields $150k profit. That's too much compared with mining and pretty fast too (travel time between stations is 10 sec)
The preview ends after 50 planets. This is the only difference.