I think they designed some bosses backwards as a boss's shield was behind it. I don't know what you think, but wouldn't shields on front offer protection? Otherwise, it is a very good game with tons of units and upgrades. There's nothing really wrong with it, so 4/5 (That's a excellent, I only give 5s to revolutionary games)
These guys know they got you by the balls when it comes to missions. You get 1000 of something, start the mission, get killed, then you either cough up 600 cubits or get those 1000 fragmented Coords again.