aye, thanks for reading it. I do def recommend looking into either giving the enemy equipment or making it more dangerous to board the enemy as well as more reliable ways to get psykers (you could make it possible for the craft to either be damageable or for it to take longer depending on the strength of the enemy's weapons/shields/thrusters so that there is an incentive to first damage the enemy craft before sending in your people) (as for the second, mixing up the people available at trading stations could work - rather than having one type filling all three slots)
I def see potential with the game so I wish you luck sir!