It looks quite nice, I cannot wait to play the final game.
Some things I noticed:
Drengin colony ship and mine arrived at a planet at the same time. My ship stopped one hex away and kept giving me the idle ship warning. I clicked on the planet to colonize but nothing happened. Drengin colony ship stayed there one hex away as well for the entire game. I tried to attack their colony ship but I could not enter a battle.
I had an established colony with ships in orbit. Small Drengin fleet moved in and took over. No battle, no nothing, they just moved in and took over.
I will add more later once I find my notes.