Loving it so far, just played through the entirety of Act 1.
Found a couple of bugs, but I haven't managed to reproduce them consistently.
Sometimes, the soldiers don't spawn even when the robots start moving towards the ship. Seems to have something to do with doubling the speed before the level starts.
Also, sometimes, the change class and shield options remain locked for the entirety of the level, forcing all your soldiers to remain cadets.
Other than those bugs, this is a great game.