I've played it a bit. I think the tech decisions and diplomacy need to be improved. Last time I played all the AI chose 80% of the same techs, they often don't pick higher end hull-techs at all. And I tried to become a trade focused state, but you literally couldn't perpetuate the large trade deals as the tolerance decay was slower than the size of large trade deals. Now you can surpass tolerance caps at a penalty, but he hasn't addressed the decay rate, so you can keep penalizing yourself to be a trader. Silly.
The highway system of Stardrive 1 (sub-space projectors) is basically just broken in Stardrive 2 right now, so as your empire grows you have very little capacity to benefit from that growth other than the overpowered empire-wide resource bonuses as you have to split and regionalize your forces to respond to AI doomstacks.
The AI is often capable of pinpointing undefended systems deep within your space (which they have no line of sight on) and sending huge fleets right at them with very little concern for fuel. I'm curious if they even use fuel. It's not like Zero has claimed that the AI doesn't cheat. They do, but exactly where they cheat is left a mystery for the players to resolve. Of course they're not very threatening most of the time as they generally use the exact same weapons and armor for the entire game.
It has potential, and I enjoy the concept, but some of the features and quests are mud thrown at the wall type of things.