So, after having played a bit, here's a list of things I wished the game would've told me when I started out:
1) How the minimap works (you can't scroll, the box represents your screen, etc.) and what the symbols on it represent
2) The fact that the ammo for weapons which have limited ammo replenishes between battles
3) The fact that random stuff can happen on the solar system map while you're sitting there doing nothing
4) How to deal with things like radiation events
5) Whether it is possible to change my flagship
6) What the funny green circles that appear when you press Z
7) That the WASD controls move you global directions
What space junk and ice chunks do (the red flashing thing is kinda alarming. It should be made clear that these things don't damage the ship)
9) I'm not sure if this was mentioned in the first combat how-to box, but the fact that shields recharge
But overall, seems quite interesting and promising
Keep up the great work, guys!