Imo for the game i played i'd say :
Complexity 3 i agree there is not so much mechanics
Strategy 3 you can't see enough in the future in my opinion to build real strategy without gambling, but yeah there is strategy to build, 4 is not so bad as a rating, would probably personnaly up to 4/5 if there was a mechanisms to see the 3 or 5 next cards, maybe would broke the game and advantage too much player 1 but not so sure there is probably way to equilibrate that, i think that could be an interresting rule.
Luck 3, because there's some card that can really flip a bit the game, like i play risky, have no money and finally and up with a +10 and be finally totaly fine. Or draw no big card when you have good setup. Can't find symbol of technology you're building. Mobilize card is really random too. There is too much lack of control in many situation to put luck 3/5.
When a game like splendor duel have 3/5 as luck, for me it's a joke because i feel having so much more control in Splendor Duel than in Zenith.
Interaction 4, the rating is good there imo, you interact with board and resource of other player. There's bonus, that are shared.