I love how games put tutorial like-messages into load screens. These are screens that people are forced to look at while the game loads so it's great when some insights about the game at least be learned while staring at them.
I think Fallout 4 is a good example of this because helpful messages rotate out periodically. Now, the problem I have with any game that does this, is that the load screens often don't stick around long enough to see what the tutorial or tip message even said.
The levels in Siege of Centauri were well optimized it seems because I rarely get to read the full message. Could a prompt be added to the load screen? A simple, "Hit any key to continue" that appears at the bottom of the screen when everything is fully loaded.
And last but not least, campaigning for the Ion Cannon to be revisited/refined.